feat(submissions): Composer Slice C — building blocks library (m/paliad#141)

Per the design at docs/design-submission-generator-v2-2026-05-26.md §8
and the Q2 / Q9 ratifications:

- Q2 (m, 2026-05-26): building blocks are plain text paste sources.
  No building_block_id reference is stored on submission_sections.
- Q9 (m, 2026-05-26): four visibility tiers — private / team / firm
  / global.

Schema (mig 149):

- paliad.submission_building_blocks — library catalog. Columns: slug,
  firm (NULL = cross-firm), section_key (binds to one section kind),
  proceeding_family (NULL = any), title_de/_en + description_de/_en
  + content_md_de/_en, author_id, visibility (CHECK in 4-tier set),
  is_published, created_at, updated_at, deleted_at (soft delete).
  RLS: coarse-grained SELECT — every authenticated user sees
  non-deleted non-private rows + own private rows. Tier-specific
  predicate (private/team/firm/global) applied in Go-layer service so
  semantics evolve without RLS migrations. Mutations admin-only (no
  RLS write paths).

- paliad.submission_building_block_admin_versions — append-only
  history per block, retention=20. Admin-side only; NOT referenced
  from submission_sections (per Q2's plain-text-paste model). Exists
  so accidental delete / overwrite are recoverable.

Backend:

- internal/services/submission_building_block_service.go (~510 LoC):
  BuildingBlockService. ListVisible applies tier predicate at query
  time (private = author_id match; firm = firm column NULL OR matches
  branding.Name; team = author shares a project_team with caller via
  paliad.project_teams self-join; global = open). ListAllForAdmin
  drops the predicate. Create + Update + SoftDelete + RestoreVersion
  all transactional; appendVersionTx writes one audit row +
  GC-deletes anything past the retention=20 horizon in the same tx.
  InsertIntoSection (the paste mechanic) clones content_md_<lang>
  into the section row with a "\n\n" separator if section already has
  content. NO building_block_id stamped per Q2.

- internal/handlers/submission_building_blocks.go (~480 LoC): nine
  handlers split between the lawyer-facing picker (list, insert) and
  the admin editor (list, get, create, update, delete, list-versions,
  restore-version, page). buildingBlockUpdateInput uses presence-
  tracking UnmarshalJSON for the four nullable fields (firm,
  proceeding_family, description_de/_en) so PATCH can distinguish
  "no change" from "set to null".

- Routes registered: lawyer-facing under /api/submission-building-blocks,
  admin-gated under /api/admin/submission-building-blocks/* and
  /admin/submission-building-blocks (page).

- Wiring: handlers.Services + dbServices + cmd/server/main.go all
  gain SubmissionBuildingBlock. NewBuildingBlockService takes the
  branding.Name firm hint for the visibility predicate.

Frontend:

- frontend/src/admin-submission-building-blocks.tsx (~85 LoC):
  three-pane admin shell (list / editor / version log) registered
  in build.ts.

- frontend/src/client/admin-submission-building-blocks.ts (~370
  LoC): admin client — list paint, edit form (slug + firm +
  section_key + proceeding_family + title/desc/content per lang +
  visibility radio + is_published toggle), per-block version log
  with restore button. Bilingual labels.

- frontend/src/client/submission-draft.ts: per-section "+ Baustein"
  button on the Composer editor toolbar (Slice B substrate gets one
  more affordance). openBlockPicker opens a modal filtered to the
  section's section_key, 200ms-debounced search by free text against
  title/description/content. Click a hit → POST insert-into-section
  → section row's content_md_<lang> gains the block's content
  appended at the end (Q2's plain-text paste semantic, no lineage).

- ~240 LoC of CSS: modal overlay + picker rows with tier-colored
  visibility chips + admin editor 3-pane grid + form rows + version
  list.

- 12 new i18n keys × 2 langs (admin.building_blocks.*).

Tests:
- TestValidVisibility (8 cases including case-sensitivity + empty).
- TestAppendBlockContent (8 cases covering empty-existing / empty-
  addition / whitespace-only / trailing newline collapse).
- TestBuildingBlockVisibilityConstants pins the 4 string literals
  against drift (RLS predicate + DB CHECK depend on them).

Build hygiene: go build/vet/test -short clean; bun run build clean
(2906 i18n keys, data-i18n scan clean).

Hard rules per ratifications honoured:
- Q2: no building_block_id lineage on sections (paste is plain text).
- Q9: 4 visibility tiers (private/team/firm/global).
- NO behavior change for pre-Composer drafts (the picker just doesn't
  show — section list is hidden for base_id NULL drafts).
- {{rule.X}} aliases preserved (block content goes through the same
  v1 placeholder pass on export as section prose).

NOT in scope per Slice C brief:
- User-authored private blocks (Slice C ships admin curation only;
  any-user create is a follow-up).
- Tier promotion review workflow (admin sets tier directly today).
- Per-section "where is this block used" reverse lookup (no lineage
  to query).
- Slice D's rich-prose features (headings, lists, blockquote) still
  Slice D's job; this Slice doesn't extend the MD walker.

t-paliad-315 Slice C

cmd/server/main.go

@@ -12,6 +12,7 @@ import (
 	"strconv"
 	"strings"
 	"syscall"
+	"time"
 
 	// Embed Go's IANA tz database into the binary so time.LoadLocation works
 	// without OS tzdata. The runtime image (alpine) doesn't ship /usr/share/
@@ -159,6 +160,21 @@ func main() {
 		submissionVarsSvc := services.NewSubmissionVarsService(pool, projectSvc, partySvc, users)
 		submissionRenderer := services.NewSubmissionRenderer()
 		submissionDraftSvc := services.NewSubmissionDraftService(pool, projectSvc, submissionVarsSvc, submissionRenderer)
+		// t-paliad-313 Composer Slice A — base catalog + section seeding.
+		// AttachComposer wires both into the draft service so Create
+		// seeds base_id + submission_sections rows on new drafts. v1
+		// fallback path stays active for pre-Composer drafts (base_id
+		// NULL, no section rows).
+		submissionBaseSvc := services.NewBaseService(pool)
+		submissionSectionSvc := services.NewSectionService(pool)
+		submissionDraftSvc.AttachComposer(submissionBaseSvc, submissionSectionSvc, branding.Name)
+		// t-paliad-313 Slice B — render-pipeline assembler. Reuses the
+		// existing SubmissionRenderer for the final placeholder pass so
+		// the {{rule.X}} alias contract stays preserved inside the
+		// composed body.
+		submissionComposerSvc := services.NewSubmissionComposer(submissionRenderer)
+		// t-paliad-315 Slice C — building-block library.
+		submissionBuildingBlockSvc := services.NewBuildingBlockService(pool, branding.Name)
 		// t-paliad-225 Slice A — user-authored checklist templates.
 		// Slice B adds checklist_shares grants + admin promotion.
 		checklistCatalogSvc := services.NewChecklistCatalogService(pool)
@@ -170,7 +186,11 @@ func main() {
 			Team:           teamSvc,
 			PartnerUnit:    partnerUnitSvc,
 			Party:          partySvc,
-			SubmissionDraft: submissionDraftSvc,
+			SubmissionDraft:         submissionDraftSvc,
+			SubmissionBase:          submissionBaseSvc,
+			SubmissionSection:       submissionSectionSvc,
+			SubmissionComposer:      submissionComposerSvc,
+			SubmissionBuildingBlock: submissionBuildingBlockSvc,
 			Deadline:       deadlineSvc,
 			Appointment:    appointmentSvc,
 			CalDAV:         caldavSvc,
@@ -221,6 +241,8 @@ func main() {
 			Export: services.NewExportService(pool, branding.Name),
 			// t-paliad-265 / m/paliad#96 — per-event-card optional choices.
 			EventChoice: services.NewEventChoiceService(pool, projectSvc, users),
+			// Slice D (m/paliad#124 §5, mig 145) — named scenario compositions.
+			Scenario: services.NewScenarioService(pool, projectSvc, rules),
 		}
 
 		// t-paliad-246 Slice A — Backup Mode runner. Wired only when
@@ -337,6 +359,13 @@ func main() {
 			log.Printf("CalDAV start: %v", err)
 		}
 		reminderSvc.Start(bgCtx)
+		// Slice B.2 dual-write drift check (t-paliad-305 / m/paliad#93).
+		// Runs every 6 h while the new procedural_events / sequencing_rules /
+		// legal_sources tables shadow the legacy paliad.deadline_rules
+		// table. A clean run logs at INFO; drift logs at WARN with the
+		// full report so a broken dual-write surfaces before the next
+		// deploy.
+		services.StartDualWriteDriftCheckLoop(bgCtx, pool, 6*time.Hour)
 		go func() {
 			<-bgCtx.Done()
 			log.Println("background services: shutdown signal received")

frontend/build.ts

@@ -40,6 +40,7 @@ import { renderAdminTeam } from "./src/admin-team";
 import { renderAdminAuditLog } from "./src/admin-audit-log";
 import { renderAdminPartnerUnits } from "./src/admin-partner-units";
 import { renderAdminEmailTemplates } from "./src/admin-email-templates";
+import { renderAdminSubmissionBuildingBlocks } from "./src/admin-submission-building-blocks";
 import { renderAdminEmailTemplatesEdit } from "./src/admin-email-templates-edit";
 import { renderAdminEventTypes } from "./src/admin-event-types";
 import { renderAdminApprovalPolicies } from "./src/admin-approval-policies";
@@ -278,6 +279,7 @@ async function build() {
       join(import.meta.dir, "src/client/admin-partner-units.ts"),
       join(import.meta.dir, "src/client/admin-email-templates.ts"),
       join(import.meta.dir, "src/client/admin-email-templates-edit.ts"),
+      join(import.meta.dir, "src/client/admin-submission-building-blocks.ts"),
       join(import.meta.dir, "src/client/admin-event-types.ts"),
       join(import.meta.dir, "src/client/admin-approval-policies.ts"),
       join(import.meta.dir, "src/client/admin-broadcasts.ts"),
@@ -409,6 +411,7 @@ async function build() {
   await Bun.write(join(DIST, "admin-partner-units.html"), renderAdminPartnerUnits());
   await Bun.write(join(DIST, "admin-email-templates.html"), renderAdminEmailTemplates());
   await Bun.write(join(DIST, "admin-email-templates-edit.html"), renderAdminEmailTemplatesEdit());
+  await Bun.write(join(DIST, "admin-submission-building-blocks.html"), renderAdminSubmissionBuildingBlocks());
   await Bun.write(join(DIST, "admin-event-types.html"), renderAdminEventTypes());
   await Bun.write(join(DIST, "admin-approval-policies.html"), renderAdminApprovalPolicies());
   await Bun.write(join(DIST, "admin-broadcasts.html"), renderAdminBroadcasts());

frontend/src/admin-submission-building-blocks.tsx

@@ -0,0 +1,77 @@
+import { h } from "./jsx";
+import { Sidebar } from "./components/Sidebar";
+import { PaliadinWidget } from "./components/PaliadinWidget";
+import { BottomNav } from "./components/BottomNav";
+import { Footer } from "./components/Footer";
+import { PWAHead } from "./components/PWAHead";
+
+// /admin/submission-building-blocks — Composer building-blocks library
+// editor (t-paliad-315 Slice C). Three-pane layout: list on the left,
+// edit form in the middle, version log on the right. Hydrated by
+// client/admin-submission-building-blocks.ts from
+// GET /api/admin/submission-building-blocks.
+
+export function renderAdminSubmissionBuildingBlocks(): string {
+  return "<!DOCTYPE html>" + (
+    <html lang="de">
+      <head>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover" />
+        <meta name="theme-color" content="#BFF355" />
+        <meta name="apple-mobile-web-app-capable" content="yes" />
+        <meta name="apple-mobile-web-app-status-bar-style" content="default" />
+        <PWAHead />
+        <title data-i18n="admin.building_blocks.title">Bausteine &mdash; Paliad</title>
+        <link rel="stylesheet" href="/assets/global.css" />
+      </head>
+      <body className="has-sidebar">
+        <Sidebar currentPath="/admin/submission-building-blocks" />
+        <BottomNav currentPath="/admin/submission-building-blocks" />
+
+        <main>
+          <section className="tool-page">
+            <div className="container">
+              <div className="tool-header">
+                <div>
+                  <h1 data-i18n="admin.building_blocks.heading">Bausteine</h1>
+                  <p className="tool-subtitle" data-i18n="admin.building_blocks.subtitle">
+                    Wiederverwendbare Textbausteine f&uuml;r Composer-Abschnitte.
+                  </p>
+                </div>
+                <div className="tool-header-actions">
+                  <button
+                    type="button"
+                    id="admin-bb-new-btn"
+                    className="btn-primary btn-cta-lime"
+                    data-i18n="admin.building_blocks.action.new">
+                    + Neuer Baustein
+                  </button>
+                </div>
+              </div>
+
+              <div id="admin-bb-feedback" className="form-msg" style="display:none" />
+
+              <div className="admin-bb-layout">
+                <aside className="admin-bb-list" id="admin-bb-list">
+                  <div className="admin-bb-loading" data-i18n="admin.building_blocks.loading">L&auml;dt&hellip;</div>
+                </aside>
+
+                <section className="admin-bb-editor" id="admin-bb-editor">
+                  <p className="admin-bb-empty" data-i18n="admin.building_blocks.editor.empty">
+                    W&auml;hlen Sie einen Baustein aus der Liste &mdash; oder erstellen Sie einen neuen.
+                  </p>
+                </section>
+
+                <aside className="admin-bb-versions" id="admin-bb-versions" />
+              </div>
+            </div>
+          </section>
+        </main>
+
+        <Footer />
+        <PaliadinWidget />
+        <script src="/assets/admin-submission-building-blocks.js"></script>
+      </body>
+    </html>
+  );
+}

frontend/src/client/admin-submission-building-blocks.ts

@@ -0,0 +1,429 @@
+import { initI18n, t, getLang } from "./i18n";
+import { initSidebar } from "./sidebar";
+
+function isEN(): boolean { return getLang() === "en"; }
+
+// /admin/submission-building-blocks — Composer building-blocks admin
+// editor (t-paliad-315 Slice C). Three-pane layout: list → editor →
+// version log. CRUD via /api/admin/submission-building-blocks/*.
+//
+// Per Q2 ratification (m, 2026-05-26): building blocks are plain text
+// paste sources. The editor here is curator-only — no per-section
+// lineage to surface, no "where is this block used" view.
+
+interface BuildingBlockJSON {
+  id: string;
+  slug: string;
+  firm?: string | null;
+  section_key: string;
+  proceeding_family?: string | null;
+  title_de: string;
+  title_en: string;
+  description_de?: string | null;
+  description_en?: string | null;
+  content_md_de: string;
+  content_md_en: string;
+  author_id?: string | null;
+  visibility: string;
+  is_published: boolean;
+  created_at: string;
+  updated_at: string;
+}
+
+interface VersionJSON {
+  id: string;
+  building_block_id: string;
+  content_md_de: string;
+  content_md_en: string;
+  title_de: string;
+  title_en: string;
+  edited_by?: string | null;
+  note?: string | null;
+  created_at: string;
+}
+
+const VISIBILITIES = ["private", "team", "firm", "global"];
+
+// Section keys must match what the Composer base spec declares for
+// each section (see internal/db/migrations/146_submission_bases.up.sql).
+const SECTION_KEYS = [
+  "letterhead", "caption", "introduction", "requests",
+  "facts", "legal_argument", "evidence", "exhibits",
+  "closing", "signature",
+];
+
+const state = {
+  blocks: [] as BuildingBlockJSON[],
+  selectedID: null as string | null,
+  versions: [] as VersionJSON[],
+  dirty: false,
+};
+
+async function boot(): Promise<void> {
+  initI18n();
+  initSidebar();
+  await loadList();
+  document.getElementById("admin-bb-new-btn")?.addEventListener("click", onNew);
+}
+
+async function loadList(): Promise<void> {
+  try {
+    const res = await fetch("/api/admin/submission-building-blocks", { credentials: "include" });
+    if (!res.ok) {
+      feedback(`HTTP ${res.status}`, true);
+      return;
+    }
+    const body = await res.json() as { blocks?: BuildingBlockJSON[] };
+    state.blocks = body.blocks ?? [];
+    paintList();
+  } catch (err) {
+    feedback(String(err), true);
+  }
+}
+
+function paintList(): void {
+  const host = document.getElementById("admin-bb-list");
+  if (!host) return;
+  host.innerHTML = "";
+  if (state.blocks.length === 0) {
+    const empty = document.createElement("p");
+    empty.className = "admin-bb-empty";
+    empty.textContent = isEN() ? "No blocks yet." : "Noch keine Bausteine.";
+    host.appendChild(empty);
+    return;
+  }
+  for (const b of state.blocks) {
+    const row = document.createElement("button");
+    row.type = "button";
+    row.className = "admin-bb-list-row";
+    if (b.id === state.selectedID) row.classList.add("admin-bb-list-row--active");
+    const title = isEN() ? b.title_en : b.title_de;
+    row.innerHTML = `
+      <span class="admin-bb-list-title">${escapeHTML(title || b.slug)}</span>
+      <span class="admin-bb-list-meta">
+        <span class="admin-bb-list-section">${escapeHTML(b.section_key)}</span>
+        <span class="admin-bb-list-vis admin-bb-list-vis--${escapeHTML(b.visibility)}">${escapeHTML(b.visibility)}</span>
+        ${b.is_published ? "" : `<span class="admin-bb-list-draft">${isEN() ? "draft" : "Entwurf"}</span>`}
+      </span>`;
+    row.addEventListener("click", () => onSelect(b.id));
+    host.appendChild(row);
+  }
+}
+
+async function onSelect(id: string): Promise<void> {
+  state.selectedID = id;
+  state.dirty = false;
+  paintList();
+  const b = state.blocks.find(x => x.id === id);
+  if (!b) return;
+  paintEditor(b);
+  await loadVersions(id);
+}
+
+function onNew(): void {
+  state.selectedID = null;
+  state.versions = [];
+  state.dirty = false;
+  paintList();
+  paintEditor(null);
+  paintVersions();
+}
+
+function paintEditor(b: BuildingBlockJSON | null): void {
+  const host = document.getElementById("admin-bb-editor");
+  if (!host) return;
+  const isNew = b === null;
+  const data = b ?? {
+    id: "",
+    slug: "",
+    firm: "",
+    section_key: "requests",
+    proceeding_family: "",
+    title_de: "",
+    title_en: "",
+    description_de: "",
+    description_en: "",
+    content_md_de: "",
+    content_md_en: "",
+    visibility: "firm",
+    is_published: false,
+  } as Partial<BuildingBlockJSON>;
+
+  host.innerHTML = "";
+  const form = document.createElement("form");
+  form.className = "admin-bb-form";
+  form.addEventListener("submit", (e) => { e.preventDefault(); onSave(isNew); });
+
+  form.appendChild(textField("slug", isEN() ? "Slug" : "Slug", data.slug ?? "", true));
+  form.appendChild(textField("firm", "Firm", data.firm ?? "", false, isEN() ? "leer = firmenagnostisch" : "leer = firmenagnostisch"));
+  form.appendChild(selectField("section_key", isEN() ? "Section key" : "Abschnitts-Slug", data.section_key ?? "requests", SECTION_KEYS, false));
+  form.appendChild(textField("proceeding_family", isEN() ? "Proceeding family" : "Verfahrensfamilie", data.proceeding_family ?? "", false, "z. B. de.inf.lg"));
+  form.appendChild(textField("title_de", "Titel (DE)", data.title_de ?? "", true));
+  form.appendChild(textField("title_en", "Title (EN)", data.title_en ?? "", true));
+  form.appendChild(textareaField("description_de", "Beschreibung (DE)", data.description_de ?? "", 2));
+  form.appendChild(textareaField("description_en", "Description (EN)", data.description_en ?? "", 2));
+  form.appendChild(textareaField("content_md_de", isEN() ? "Content (DE Markdown)" : "Inhalt (DE Markdown)", data.content_md_de ?? "", 10));
+  form.appendChild(textareaField("content_md_en", isEN() ? "Content (EN Markdown)" : "Inhalt (EN Markdown)", data.content_md_en ?? "", 10));
+  form.appendChild(selectField("visibility", isEN() ? "Visibility" : "Sichtbarkeit", data.visibility ?? "firm", VISIBILITIES, false));
+  form.appendChild(checkboxField("is_published", isEN() ? "Published" : "Veröffentlicht", Boolean(data.is_published)));
+
+  if (!isNew) {
+    form.appendChild(textField("note", isEN() ? "Save note (optional)" : "Speicher-Notiz (optional)", "", false));
+  }
+
+  const actions = document.createElement("div");
+  actions.className = "admin-bb-form-actions";
+
+  const save = document.createElement("button");
+  save.type = "submit";
+  save.className = "btn-primary btn-cta-lime";
+  save.textContent = isEN() ? "Save" : "Speichern";
+  actions.appendChild(save);
+
+  if (!isNew) {
+    const del = document.createElement("button");
+    del.type = "button";
+    del.className = "btn-link-danger";
+    del.textContent = isEN() ? "Delete" : "Löschen";
+    del.addEventListener("click", () => onDelete());
+    actions.appendChild(del);
+  }
+  form.appendChild(actions);
+  host.appendChild(form);
+}
+
+function textField(name: string, label: string, value: string, required: boolean, hint?: string): HTMLElement {
+  const wrap = document.createElement("label");
+  wrap.className = "admin-bb-form-row";
+  const lab = document.createElement("span");
+  lab.textContent = label + (required ? " *" : "");
+  wrap.appendChild(lab);
+  const input = document.createElement("input");
+  input.type = "text";
+  input.name = name;
+  input.className = "entity-form-input";
+  input.value = value;
+  if (required) input.required = true;
+  wrap.appendChild(input);
+  if (hint) {
+    const h = document.createElement("small");
+    h.className = "admin-bb-form-hint";
+    h.textContent = hint;
+    wrap.appendChild(h);
+  }
+  return wrap;
+}
+
+function textareaField(name: string, label: string, value: string, rows: number): HTMLElement {
+  const wrap = document.createElement("label");
+  wrap.className = "admin-bb-form-row";
+  const lab = document.createElement("span");
+  lab.textContent = label;
+  wrap.appendChild(lab);
+  const ta = document.createElement("textarea");
+  ta.name = name;
+  ta.className = "entity-form-input";
+  ta.rows = rows;
+  ta.value = value;
+  wrap.appendChild(ta);
+  return wrap;
+}
+
+function selectField(name: string, label: string, value: string, options: string[], required: boolean): HTMLElement {
+  const wrap = document.createElement("label");
+  wrap.className = "admin-bb-form-row";
+  const lab = document.createElement("span");
+  lab.textContent = label + (required ? " *" : "");
+  wrap.appendChild(lab);
+  const sel = document.createElement("select");
+  sel.name = name;
+  sel.className = "entity-form-input";
+  for (const opt of options) {
+    const o = document.createElement("option");
+    o.value = opt;
+    o.textContent = opt;
+    if (opt === value) o.selected = true;
+    sel.appendChild(o);
+  }
+  wrap.appendChild(sel);
+  return wrap;
+}
+
+function checkboxField(name: string, label: string, value: boolean): HTMLElement {
+  const wrap = document.createElement("label");
+  wrap.className = "admin-bb-form-row admin-bb-form-row--checkbox";
+  const input = document.createElement("input");
+  input.type = "checkbox";
+  input.name = name;
+  input.checked = value;
+  wrap.appendChild(input);
+  const lab = document.createElement("span");
+  lab.textContent = label;
+  wrap.appendChild(lab);
+  return wrap;
+}
+
+async function onSave(isNew: boolean): Promise<void> {
+  const form = document.querySelector(".admin-bb-form") as HTMLFormElement | null;
+  if (!form) return;
+  const data = new FormData(form);
+  const payload: Record<string, unknown> = {};
+  for (const key of ["slug", "section_key", "title_de", "title_en", "content_md_de", "content_md_en", "visibility"]) {
+    const v = data.get(key);
+    if (v !== null) payload[key] = String(v);
+  }
+  for (const key of ["firm", "proceeding_family", "description_de", "description_en"]) {
+    const v = data.get(key);
+    if (v !== null) {
+      const s = String(v).trim();
+      payload[key] = s === "" ? null : s;
+    }
+  }
+  payload.is_published = (data.get("is_published") === "on");
+  if (!isNew) {
+    const note = data.get("note");
+    if (note) payload.note = String(note);
+  }
+  try {
+    const url = isNew
+      ? "/api/admin/submission-building-blocks"
+      : `/api/admin/submission-building-blocks/${state.selectedID}`;
+    const method = isNew ? "POST" : "PATCH";
+    const res = await fetch(url, {
+      method,
+      credentials: "include",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(payload),
+    });
+    if (!res.ok) {
+      const body = await res.json().catch(() => ({} as { error?: string }));
+      feedback(body.error ?? `HTTP ${res.status}`, true);
+      return;
+    }
+    const saved = await res.json() as BuildingBlockJSON;
+    feedback(isEN() ? "Saved." : "Gespeichert.", false);
+    await loadList();
+    state.selectedID = saved.id;
+    paintList();
+    paintEditor(saved);
+    await loadVersions(saved.id);
+  } catch (err) {
+    feedback(String(err), true);
+  }
+}
+
+async function onDelete(): Promise<void> {
+  if (!state.selectedID) return;
+  const sure = confirm(isEN() ? "Delete this block?" : "Diesen Baustein löschen?");
+  if (!sure) return;
+  try {
+    const res = await fetch(`/api/admin/submission-building-blocks/${state.selectedID}`, {
+      method: "DELETE",
+      credentials: "include",
+    });
+    if (!res.ok && res.status !== 204) {
+      feedback(`HTTP ${res.status}`, true);
+      return;
+    }
+    feedback(isEN() ? "Deleted." : "Gelöscht.", false);
+    state.selectedID = null;
+    await loadList();
+    paintEditor(null);
+    state.versions = [];
+    paintVersions();
+  } catch (err) {
+    feedback(String(err), true);
+  }
+}
+
+async function loadVersions(blockID: string): Promise<void> {
+  try {
+    const res = await fetch(`/api/admin/submission-building-blocks/${blockID}/versions`, { credentials: "include" });
+    if (!res.ok) {
+      state.versions = [];
+      paintVersions();
+      return;
+    }
+    const body = await res.json() as { versions?: VersionJSON[] };
+    state.versions = body.versions ?? [];
+    paintVersions();
+  } catch {
+    state.versions = [];
+    paintVersions();
+  }
+}
+
+function paintVersions(): void {
+  const host = document.getElementById("admin-bb-versions");
+  if (!host) return;
+  host.innerHTML = "";
+  if (state.versions.length === 0) return;
+  const h = document.createElement("h3");
+  h.textContent = isEN() ? "History" : "Verlauf";
+  host.appendChild(h);
+  for (const v of state.versions) {
+    const row = document.createElement("div");
+    row.className = "admin-bb-version-row";
+    const date = new Date(v.created_at).toLocaleString();
+    row.innerHTML = `
+      <div class="admin-bb-version-meta">${escapeHTML(date)} — ${escapeHTML(v.note ?? "")}</div>`;
+    const btn = document.createElement("button");
+    btn.type = "button";
+    btn.className = "btn-small btn-secondary";
+    btn.textContent = isEN() ? "Restore" : "Wiederherstellen";
+    btn.addEventListener("click", () => onRestore(v.id));
+    row.appendChild(btn);
+    host.appendChild(row);
+  }
+}
+
+async function onRestore(versionID: string): Promise<void> {
+  if (!state.selectedID) return;
+  try {
+    const res = await fetch(
+      `/api/admin/submission-building-blocks/${state.selectedID}/restore/${versionID}`,
+      { method: "POST", credentials: "include" },
+    );
+    if (!res.ok) {
+      feedback(`HTTP ${res.status}`, true);
+      return;
+    }
+    const restored = await res.json() as BuildingBlockJSON;
+    feedback(isEN() ? "Restored." : "Wiederhergestellt.", false);
+    paintEditor(restored);
+    await loadVersions(restored.id);
+    await loadList();
+  } catch (err) {
+    feedback(String(err), true);
+  }
+}
+
+function feedback(msg: string, isError: boolean): void {
+  const host = document.getElementById("admin-bb-feedback");
+  if (!host) return;
+  host.style.display = "";
+  host.className = "form-msg " + (isError ? "form-msg--error" : "form-msg--ok");
+  host.textContent = msg;
+  if (!isError) {
+    setTimeout(() => { host.style.display = "none"; }, 3000);
+  }
+}
+
+function escapeHTML(s: string): string {
+  return s
+    .replace(/&/g, "&amp;")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&#39;");
+}
+
+// Silence unused-import warning when t() isn't called directly — i18n
+// is initialised so data-i18n attrs render on first paint.
+void t;
+
+if (document.readyState === "loading") {
+  document.addEventListener("DOMContentLoaded", boot);
+} else {
+  void boot();
+}

frontend/src/client/i18n.ts

@@ -79,7 +79,7 @@ const translations: Record<Lang, Record<string, string>> = {
     "changelog.tag.fix": "Fix",
 
     // Footer
-    "footer.text": "\u00a9 2026 Paliad \u2014 ein Werkzeug von",
+    "footer.text": "\u00a9 2026 Paliad \u2014 by",
 
     // Landing page
     "index.title": `Paliad \u2014 Patent Litigation f\u00fcr ${FIRM}`,
@@ -463,10 +463,6 @@ const translations: Record<Lang, Record<string, string>> = {
     "deadlines.side.from_project": "Aus Akte:",
     "deadlines.side.override": "Andere Seite wählen",
     "deadlines.side.hint": "Wählen Sie eine Seite, um die Spalten zu fokussieren.",
-    "deadlines.appellant.label": "Berufung durch:",
-    "deadlines.appellant.claimant": "Klägerseite",
-    "deadlines.appellant.defendant": "Beklagtenseite",
-    "deadlines.appellant.none": "—",
     "deadlines.event.composite.label": "Zusammengesetzt:",
     "deadlines.event.unit.days.one": "Tag",
     "deadlines.event.unit.days.many": "Tage",
@@ -1524,6 +1520,18 @@ const translations: Record<Lang, Record<string, string>> = {
     "submissions.draft.language.de": "DE",
     "submissions.draft.language.en": "EN",
     "submissions.draft.language.fallback_notice": "Fallback: universelles Skelett (keine sprachspezifische Vorlage).",
+    // t-paliad-313 (m/paliad#141) Composer Slice A — base picker + section list.
+    "submissions.draft.base.label": "Vorlagenbasis",
+    "submissions.draft.base.hint": "Steuert Schriftarten, Briefkopf und Abschnitts-Defaults.",
+    "submissions.draft.sections.title": "Abschnitte",
+    "submissions.draft.sections.hint": "Inhalt pro Abschnitt — Autosave nach 500 ms. Letztes Layout in Word.",
+    // t-paliad-315 (m/paliad#141) Composer Slice C — building blocks admin.
+    "admin.building_blocks.title": "Bausteine — Paliad",
+    "admin.building_blocks.heading": "Bausteine",
+    "admin.building_blocks.subtitle": "Wiederverwendbare Textbausteine für Composer-Abschnitte.",
+    "admin.building_blocks.loading": "Lädt…",
+    "admin.building_blocks.action.new": "+ Neuer Baustein",
+    "admin.building_blocks.editor.empty": "Wählen Sie einen Baustein aus der Liste — oder erstellen Sie einen neuen.",
     // t-paliad-240 — global Schriftsätze drafts index page.
     "submissions.index.title": "Schriftsätze — Paliad",
     "submissions.index.heading": "Schriftsätze",
@@ -3178,7 +3186,7 @@ const translations: Record<Lang, Record<string, string>> = {
     "changelog.tag.fix": "Fix",
 
     // Footer
-    "footer.text": "\u00a9 2026 Paliad \u2014 a tool by",
+    "footer.text": "\u00a9 2026 Paliad \u2014 by",
 
     // Landing page
     "index.title": `Paliad \u2014 Patent Litigation for ${FIRM}`,
@@ -3569,10 +3577,6 @@ const translations: Record<Lang, Record<string, string>> = {
     "deadlines.side.from_project": "From case:",
     "deadlines.side.override": "Choose other side",
     "deadlines.side.hint": "Pick a side to focus the columns.",
-    "deadlines.appellant.label": "Appeal filed by:",
-    "deadlines.appellant.claimant": "Claimant",
-    "deadlines.appellant.defendant": "Defendant",
-    "deadlines.appellant.none": "—",
     "deadlines.event.composite.label": "Composite:",
     "deadlines.event.unit.days.one": "day",
     "deadlines.event.unit.days.many": "days",
@@ -4604,6 +4608,18 @@ const translations: Record<Lang, Record<string, string>> = {
     "submissions.draft.import.button": "Import from project",
     "submissions.draft.parties.title": "Parties",
     "submissions.draft.parties.hint": "Pick the parties mentioned in this submission, or add more per side.",
+    // t-paliad-313 (m/paliad#141) Composer Slice A — base picker + section list.
+    "submissions.draft.base.label": "Template base",
+    "submissions.draft.base.hint": "Drives fonts, letterhead, and section defaults.",
+    "submissions.draft.sections.title": "Sections",
+    "submissions.draft.sections.hint": "Edit per section — autosaves after 500ms. Final layout in Word.",
+    // t-paliad-315 (m/paliad#141) Composer Slice C — building blocks admin.
+    "admin.building_blocks.title": "Building blocks — Paliad",
+    "admin.building_blocks.heading": "Building blocks",
+    "admin.building_blocks.subtitle": "Reusable text snippets for Composer sections.",
+    "admin.building_blocks.loading": "Loading…",
+    "admin.building_blocks.action.new": "+ New block",
+    "admin.building_blocks.editor.empty": "Pick a block from the list — or create a new one.",
     // t-paliad-240 — global submissions drafts index page.
     "submissions.index.title": "Submissions — Paliad",
     "submissions.index.heading": "Submissions",

frontend/src/client/submission-draft.ts

@@ -28,10 +28,47 @@ interface SubmissionDraftJSON {
   last_exported_at?: string | null;
   last_exported_sha?: string | null;
   last_imported_at?: string | null;
+  // t-paliad-313 Composer Slice A — base reference + Composer-side
+  // metadata. base_id is null on pre-Composer drafts (the v1 render
+  // path stays the fallback). composer_meta carries the seed-time
+  // section order in later slices.
+  base_id?: string | null;
+  composer_meta?: Record<string, unknown>;
   created_at: string;
   updated_at: string;
 }
 
+// t-paliad-313 Composer Slice A — per-draft section row, surfaced
+// read-only in the editor body. Slice B adds inline edit + PATCH.
+interface SubmissionSectionJSON {
+  id: string;
+  section_key: string;
+  order_index: number;
+  kind: string;
+  label_de: string;
+  label_en: string;
+  included: boolean;
+  content_md_de: string;
+  content_md_en: string;
+}
+
+// t-paliad-313 Composer Slice A — base catalog row, surfaced in the
+// sidebar picker dropdown.
+interface SubmissionBaseRow {
+  id: string;
+  slug: string;
+  firm?: string | null;
+  proceeding_family?: string | null;
+  label_de: string;
+  label_en: string;
+  description_de?: string | null;
+  description_en?: string | null;
+  gitea_path: string;
+  is_default_for: string[];
+  is_active: boolean;
+  section_count: number;
+}
+
 interface AvailablePartyJSON {
   id: string;
   name: string;
@@ -64,6 +101,9 @@ interface SubmissionDraftView {
   // language has no per-firm language-matched template.
   template_tier?: string;
   language_fallback?: boolean;
+  // t-paliad-313 Composer Slice A — per-draft section stack. Empty
+  // for pre-Composer drafts where no rows have been seeded.
+  sections: SubmissionSectionJSON[];
 }
 
 interface SubmissionDraftListResponse {
@@ -328,6 +368,11 @@ interface State {
   addPartyMode: "manual" | "search";
   addPartySearchHits: PartySearchHit[];
   addPartyBusy: boolean;
+  // t-paliad-313 Composer Slice A — base catalog fetched once on boot.
+  // Picker hidden until populated; empty array (after the fetch
+  // completes) keeps the picker hidden permanently for this load.
+  bases: SubmissionBaseRow[];
+  basesLoaded: boolean;
 }
 
 type PartySide = "claimant" | "defendant" | "other";
@@ -354,6 +399,8 @@ const state: State = {
   addPartyMode: "manual",
   addPartySearchHits: [],
   addPartyBusy: false,
+  bases: [],
+  basesLoaded: false,
 };
 
 // ─────────────────────────────────────────────────────────────────────
@@ -371,6 +418,14 @@ async function boot(): Promise<void> {
   }
   state.parsed = parsed;
 
+  // t-paliad-313 Composer Slice A — kick the base catalog fetch in
+  // parallel with the view load. The picker hydrates when both land;
+  // either failing leaves the picker hidden but the editor functional.
+  loadBases().catch(err => {
+    console.warn("submission-draft: base catalog fetch failed", err);
+    state.basesLoaded = true;
+  });
+
   try {
     if (parsed.mode === "global") {
       // Global path: we have a draft_id, fetch by id alone. Drafts
@@ -523,11 +578,13 @@ function paint(): void {
   paintNoProjectBanner();
   paintSwitcher();
   paintNameRow();
+  paintBasePicker();
   paintImportRow();
   paintPartyPicker();
   paintLanguageRow();
   paintLanguageFallback();
   paintVariables();
+  paintSectionList();
   paintPreview();
 }
 
@@ -1143,6 +1200,520 @@ function paintPreview(): void {
   }
 }
 
+// ─────────────────────────────────────────────────────────────────────
+// t-paliad-313 Composer Slice A — base picker + section list
+// ─────────────────────────────────────────────────────────────────────
+
+async function loadBases(): Promise<void> {
+  const res = await fetch("/api/submission-bases", { credentials: "include" });
+  if (!res.ok) {
+    throw new Error("base list HTTP " + res.status);
+  }
+  const body = await res.json() as { bases?: SubmissionBaseRow[] };
+  state.bases = body.bases ?? [];
+  state.basesLoaded = true;
+  // If the view has already painted, re-paint the picker so it
+  // hydrates as soon as the catalog lands. paint() is idempotent.
+  if (state.view) paintBasePicker();
+}
+
+function paintBasePicker(): void {
+  const row = document.getElementById("submission-draft-base-row") as HTMLDivElement | null;
+  const sel = document.getElementById("submission-draft-base") as HTMLSelectElement | null;
+  if (!row || !sel || !state.view) return;
+
+  // Hide the picker until the catalog has loaded AND the catalog has
+  // at least one entry. A failed fetch (basesLoaded=true, bases empty)
+  // keeps the picker hidden indefinitely so the editor stays usable.
+  if (!state.basesLoaded || state.bases.length === 0) {
+    row.style.display = "none";
+    return;
+  }
+  row.style.display = "";
+
+  // Rebuild the <option> list each paint so language toggles + base
+  // catalog updates flow through.
+  sel.innerHTML = "";
+  const currentBaseID = state.view.draft.base_id ?? "";
+
+  // "Keine Vorlagenbasis" only listed when the draft is currently in
+  // that state (pre-Composer / cleared). Avoids tempting the lawyer
+  // to clear after they've already picked one.
+  if (!currentBaseID) {
+    const opt = document.createElement("option");
+    opt.value = "";
+    opt.textContent = isEN() ? "— no base —" : "— keine Vorlagenbasis —";
+    sel.appendChild(opt);
+  }
+  for (const b of state.bases) {
+    const opt = document.createElement("option");
+    opt.value = b.id;
+    opt.textContent = isEN() ? b.label_en : b.label_de;
+    if (b.id === currentBaseID) opt.selected = true;
+    sel.appendChild(opt);
+  }
+
+  // Wire change handler once per paint. Removing then re-adding
+  // keeps the binding consistent across repaints (e.g. after
+  // language toggle re-renders the labels).
+  sel.onchange = () => { onBaseChange(sel.value); };
+}
+
+async function onBaseChange(newBaseID: string): Promise<void> {
+  if (!state.view) return;
+  const payload: Record<string, unknown> = {
+    // Empty string in the picker maps to null = clear.
+    base_id: newBaseID === "" ? null : newBaseID,
+  };
+  try {
+    const res = await fetch(
+      `/api/submission-drafts/${state.view.draft.id}`,
+      {
+        method: "PATCH",
+        credentials: "include",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(payload),
+      },
+    );
+    if (!res.ok) {
+      console.warn("base swap PATCH failed", res.status);
+      return;
+    }
+    const view = await res.json() as SubmissionDraftView;
+    state.view = view;
+    paint();
+  } catch (err) {
+    console.warn("base swap PATCH error", err);
+  }
+}
+
+// sectionAutosaveTimers — one debounce timer per section id so two
+// sections autosaving simultaneously don't trample each other. Reset
+// on each keystroke; 500ms after the last keystroke the patch fires.
+const sectionAutosaveTimers: Record<string, number> = {};
+const SECTION_AUTOSAVE_MS = 500;
+
+function paintSectionList(): void {
+  const wrap = document.getElementById("submission-draft-sections-wrap");
+  const list = document.getElementById("submission-draft-sections-list") as HTMLOListElement | null;
+  if (!wrap || !list || !state.view) return;
+
+  const sections = state.view.sections ?? [];
+  if (sections.length === 0) {
+    wrap.style.display = "none";
+    return;
+  }
+  wrap.style.display = "";
+
+  // Don't blow away the editor if a section is currently focused —
+  // would steal cursor + selection mid-type. The patch round-trip
+  // returns the updated row, but paintSectionList only re-renders
+  // when the focused section isn't being edited (or the new render
+  // is being driven by something other than the active editor itself).
+  const activeID = activeSectionEditorID();
+
+  list.innerHTML = "";
+  const lang = state.view.draft.language || state.view.lang || "de";
+  for (const sec of sections) {
+    list.appendChild(renderSectionRow(sec, lang, activeID === sec.id));
+  }
+}
+
+function renderSectionRow(sec: SubmissionSectionJSON, lang: string, isActive: boolean): HTMLLIElement {
+  const li = document.createElement("li");
+  li.className = "submission-draft-section";
+  li.dataset.sectionId = sec.id;
+  if (!sec.included) li.classList.add("submission-draft-section--excluded");
+
+  const head = document.createElement("header");
+  head.className = "submission-draft-section-head";
+
+  const title = document.createElement("h3");
+  title.className = "submission-draft-section-title";
+  title.textContent = (lang === "en" ? sec.label_en : sec.label_de) || sec.section_key;
+  head.appendChild(title);
+
+  const kind = document.createElement("span");
+  kind.className = "submission-draft-section-kind";
+  kind.textContent = sec.kind;
+  head.appendChild(kind);
+
+  if (!sec.included) {
+    const muted = document.createElement("span");
+    muted.className = "submission-draft-section-excluded-badge";
+    muted.textContent = isEN() ? "excluded" : "ausgeblendet";
+    head.appendChild(muted);
+  }
+
+  // Per-section "Aufnehmen" / "Ausblenden" toggle in the head — flips
+  // `included` via PATCH and re-paints.
+  const toggle = document.createElement("button");
+  toggle.type = "button";
+  toggle.className = "btn-small btn-secondary submission-draft-section-toggle";
+  toggle.textContent = sec.included
+    ? (isEN() ? "Hide" : "Ausblenden")
+    : (isEN() ? "Include" : "Aufnehmen");
+  toggle.addEventListener("click", () => onSectionToggleIncluded(sec));
+  head.appendChild(toggle);
+
+  li.appendChild(head);
+
+  // Toolbar — shared B/I affordance per section. Slice D extends with
+  // headings, lists, quote.
+  const toolbar = document.createElement("div");
+  toolbar.className = "submission-draft-section-toolbar";
+  toolbar.appendChild(makeToolbarButton("B", isEN() ? "Bold" : "Fett", "bold"));
+  toolbar.appendChild(makeToolbarButton("I", isEN() ? "Italic" : "Kursiv", "italic"));
+  // t-paliad-315 Slice C — building-block insert button. Opens a
+  // picker modal filtered to this section's section_key. Paste is
+  // plain-text per Q2 (no lineage stamped).
+  const bbBtn = document.createElement("button");
+  bbBtn.type = "button";
+  bbBtn.className = "btn-small btn-secondary submission-draft-section-bb-btn";
+  bbBtn.textContent = isEN() ? "+ Block" : "+ Baustein";
+  bbBtn.title = isEN() ? "Insert a saved building block" : "Baustein einfügen";
+  bbBtn.addEventListener("click", () => openBlockPicker(sec));
+  toolbar.appendChild(bbBtn);
+  li.appendChild(toolbar);
+
+  const md = (lang === "en" ? sec.content_md_en : sec.content_md_de) || "";
+  const editor = document.createElement("div");
+  editor.className = "submission-draft-section-editor";
+  editor.contentEditable = "true";
+  editor.spellcheck = true;
+  editor.dataset.sectionId = sec.id;
+  editor.dataset.lang = lang;
+  editor.dataset.placeholder = isEN()
+    ? "Write section content…"
+    : "Abschnittstext eingeben…";
+  // Paint the Markdown as plain text on first render — the editor's
+  // source of truth is Markdown, the DOM is the view. Lawyer types,
+  // we serialise back to MD on autosave.
+  editor.textContent = md;
+
+  editor.addEventListener("input", () => onSectionInput(editor));
+  editor.addEventListener("focus", () => {
+    li.classList.add("submission-draft-section--editing");
+  });
+  editor.addEventListener("blur", () => {
+    li.classList.remove("submission-draft-section--editing");
+    // Force-flush any pending autosave so we don't leave unsynced
+    // edits hanging when the lawyer tabs out.
+    flushSectionAutosave(sec.id);
+  });
+
+  li.appendChild(editor);
+
+  if (isActive) {
+    // The repaint happened while this section was focused — restore
+    // focus to it. Cursor placement at the end is a fair default
+    // (typing mid-content during a repaint is rare; the autosave path
+    // typically doesn't repaint at all).
+    queueMicrotask(() => {
+      const fresh = document.querySelector(`.submission-draft-section-editor[data-section-id="${cssEscape(sec.id)}"]`) as HTMLDivElement | null;
+      if (fresh) {
+        fresh.focus();
+        placeCaretAtEnd(fresh);
+      }
+    });
+  }
+
+  return li;
+}
+
+function makeToolbarButton(label: string, title: string, format: "bold" | "italic"): HTMLButtonElement {
+  const btn = document.createElement("button");
+  btn.type = "button";
+  btn.className = "submission-draft-section-toolbar-btn";
+  btn.textContent = label;
+  btn.title = title;
+  // Mousedown rather than click so the editor doesn't lose focus
+  // mid-command — execCommand requires the editor to be the active
+  // selection target.
+  btn.addEventListener("mousedown", (ev) => {
+    ev.preventDefault();
+    document.execCommand(format, false);
+    // Trigger the input handler so autosave fires.
+    const editor = document.activeElement as HTMLElement | null;
+    if (editor && editor.classList.contains("submission-draft-section-editor")) {
+      onSectionInput(editor as HTMLDivElement);
+    }
+  });
+  return btn;
+}
+
+function activeSectionEditorID(): string | null {
+  const active = document.activeElement as HTMLElement | null;
+  if (!active || !active.classList.contains("submission-draft-section-editor")) return null;
+  return active.dataset.sectionId ?? null;
+}
+
+function placeCaretAtEnd(el: HTMLElement): void {
+  const range = document.createRange();
+  range.selectNodeContents(el);
+  range.collapse(false);
+  const sel = window.getSelection();
+  if (!sel) return;
+  sel.removeAllRanges();
+  sel.addRange(range);
+}
+
+function onSectionInput(editor: HTMLDivElement): void {
+  const id = editor.dataset.sectionId;
+  if (!id) return;
+  if (sectionAutosaveTimers[id]) clearTimeout(sectionAutosaveTimers[id]);
+  sectionAutosaveTimers[id] = window.setTimeout(() => {
+    sectionAutosaveTimers[id] = 0;
+    flushSectionAutosave(id);
+  }, SECTION_AUTOSAVE_MS);
+}
+
+function flushSectionAutosave(sectionID: string): void {
+  if (sectionAutosaveTimers[sectionID]) {
+    clearTimeout(sectionAutosaveTimers[sectionID]);
+    sectionAutosaveTimers[sectionID] = 0;
+  }
+  const editor = document.querySelector(`.submission-draft-section-editor[data-section-id="${cssEscape(sectionID)}"]`) as HTMLDivElement | null;
+  if (!editor || !state.view) return;
+  const lang = editor.dataset.lang || state.view.draft.language || "de";
+  const md = domToMarkdown(editor);
+  void patchSection(sectionID, lang === "en" ? { content_md_en: md } : { content_md_de: md });
+}
+
+// domToMarkdown serialises a contentEditable's DOM tree back to
+// Markdown. Walks the tree: <b>/<strong> emit `**…**`, <i>/<em> emit
+// `*…*`, <br> emits a newline, block-level elements emit a blank line
+// between siblings. Slice B handles only B/I + paragraphs/line breaks
+// — Slice D's rich toolbar extends this to headings + lists + quote.
+function domToMarkdown(root: HTMLElement): string {
+  return serializeNode(root).trim();
+}
+
+function serializeNode(node: Node): string {
+  if (node.nodeType === Node.TEXT_NODE) {
+    return node.textContent ?? "";
+  }
+  if (node.nodeType !== Node.ELEMENT_NODE) return "";
+  const el = node as HTMLElement;
+  const tag = el.tagName.toLowerCase();
+  let inner = "";
+  for (const child of Array.from(el.childNodes)) {
+    inner += serializeNode(child);
+  }
+  switch (tag) {
+    case "b":
+    case "strong":
+      return inner ? `**${inner}**` : "";
+    case "i":
+    case "em":
+      return inner ? `*${inner}*` : "";
+    case "br":
+      return "\n";
+    case "div":
+    case "p":
+      // execCommand and contentEditable insert <div> on Enter in some
+      // browsers, <p> in others. Both are paragraph boundaries.
+      return inner + "\n\n";
+    default:
+      return inner;
+  }
+}
+
+async function onSectionToggleIncluded(sec: SubmissionSectionJSON): Promise<void> {
+  await patchSection(sec.id, { included: !sec.included });
+}
+
+// ─────────────────────────────────────────────────────────────────────
+// t-paliad-315 Slice C — building-block picker modal
+// ─────────────────────────────────────────────────────────────────────
+
+interface BuildingBlockPickJSON {
+  id: string;
+  slug: string;
+  section_key: string;
+  proceeding_family?: string | null;
+  title_de: string;
+  title_en: string;
+  description_de?: string | null;
+  description_en?: string | null;
+  content_md_de: string;
+  content_md_en: string;
+  visibility: string;
+}
+
+let blockPickerSearchTimer: number | null = null;
+
+function openBlockPicker(sec: SubmissionSectionJSON): void {
+  // Remove any prior picker.
+  document.getElementById("submission-bb-picker")?.remove();
+
+  const overlay = document.createElement("div");
+  overlay.id = "submission-bb-picker";
+  overlay.className = "submission-bb-picker-overlay";
+  overlay.addEventListener("click", (ev) => {
+    if (ev.target === overlay) overlay.remove();
+  });
+
+  const modal = document.createElement("div");
+  modal.className = "submission-bb-picker";
+
+  const head = document.createElement("header");
+  head.className = "submission-bb-picker-head";
+  const title = document.createElement("h2");
+  title.textContent = isEN() ? "Insert building block" : "Baustein einfügen";
+  head.appendChild(title);
+  const close = document.createElement("button");
+  close.type = "button";
+  close.className = "btn-small btn-secondary";
+  close.textContent = isEN() ? "Close" : "Schließen";
+  close.addEventListener("click", () => overlay.remove());
+  head.appendChild(close);
+  modal.appendChild(head);
+
+  const search = document.createElement("input");
+  search.type = "search";
+  search.placeholder = isEN() ? "Search blocks…" : "Bausteine suchen…";
+  search.className = "entity-form-input submission-bb-picker-search";
+  modal.appendChild(search);
+
+  const sectionInfo = document.createElement("p");
+  sectionInfo.className = "submission-bb-picker-sectioninfo";
+  sectionInfo.textContent = (isEN() ? "Section: " : "Abschnitt: ") + sec.section_key;
+  modal.appendChild(sectionInfo);
+
+  const list = document.createElement("div");
+  list.className = "submission-bb-picker-list";
+  list.textContent = isEN() ? "Loading…" : "Lädt…";
+  modal.appendChild(list);
+
+  overlay.appendChild(modal);
+  document.body.appendChild(overlay);
+
+  const fetchBlocks = async (q: string) => {
+    const params = new URLSearchParams();
+    params.set("section_key", sec.section_key);
+    if (q) params.set("q", q);
+    try {
+      const res = await fetch(`/api/submission-building-blocks?${params.toString()}`, { credentials: "include" });
+      if (!res.ok) {
+        list.textContent = `HTTP ${res.status}`;
+        return;
+      }
+      const body = await res.json() as { blocks?: BuildingBlockPickJSON[] };
+      paintPickerList(list, body.blocks ?? [], sec, overlay);
+    } catch (err) {
+      list.textContent = String(err);
+    }
+  };
+
+  search.addEventListener("input", () => {
+    if (blockPickerSearchTimer) clearTimeout(blockPickerSearchTimer);
+    blockPickerSearchTimer = window.setTimeout(() => {
+      void fetchBlocks(search.value.trim());
+    }, 200);
+  });
+
+  void fetchBlocks("");
+  setTimeout(() => search.focus(), 0);
+}
+
+function paintPickerList(host: HTMLElement, blocks: BuildingBlockPickJSON[], sec: SubmissionSectionJSON, overlay: HTMLElement): void {
+  host.innerHTML = "";
+  if (blocks.length === 0) {
+    const empty = document.createElement("p");
+    empty.className = "submission-bb-picker-empty";
+    empty.textContent = isEN() ? "No blocks match." : "Keine passenden Bausteine.";
+    host.appendChild(empty);
+    return;
+  }
+  const lang = state.view?.draft.language || "de";
+  for (const b of blocks) {
+    const row = document.createElement("button");
+    row.type = "button";
+    row.className = "submission-bb-picker-row";
+    const title = (lang === "en" ? b.title_en : b.title_de) || b.slug;
+    const desc = (lang === "en" ? b.description_en : b.description_de) || "";
+    const preview = ((lang === "en" ? b.content_md_en : b.content_md_de) || "").slice(0, 200);
+    row.innerHTML = `
+      <div class="submission-bb-picker-row-head">
+        <strong>${escapeHTML(title)}</strong>
+        <span class="submission-bb-picker-vis submission-bb-picker-vis--${escapeHTML(b.visibility)}">${escapeHTML(b.visibility)}</span>
+      </div>
+      ${desc ? `<div class="submission-bb-picker-row-desc">${escapeHTML(desc)}</div>` : ""}
+      <pre class="submission-bb-picker-row-preview">${escapeHTML(preview)}${preview.length === 200 ? "…" : ""}</pre>`;
+    row.addEventListener("click", () => {
+      void insertBlockIntoSection(b.id, sec.id, overlay);
+    });
+    host.appendChild(row);
+  }
+}
+
+async function insertBlockIntoSection(blockID: string, sectionID: string, overlay: HTMLElement): Promise<void> {
+  try {
+    const res = await fetch(
+      `/api/submission-building-blocks/${blockID}/insert-into/${sectionID}`,
+      { method: "POST", credentials: "include" },
+    );
+    if (!res.ok) {
+      console.warn("insert-into PATCH failed", res.status);
+      return;
+    }
+    const updated = await res.json() as SubmissionSectionJSON;
+    if (state.view && state.view.sections) {
+      const idx = state.view.sections.findIndex(s => s.id === sectionID);
+      if (idx >= 0) state.view.sections[idx] = updated;
+    }
+    paintSectionList();
+    overlay.remove();
+  } catch (err) {
+    console.warn("insert block error", err);
+  }
+}
+
+function escapeHTML(s: string): string {
+  return s
+    .replace(/&/g, "&amp;")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&#39;");
+}
+
+async function patchSection(sectionID: string, payload: Record<string, unknown>): Promise<void> {
+  try {
+    const draftID = state.view?.draft.id;
+    if (!draftID) return;
+    const res = await fetch(
+      `/api/submission-drafts/${draftID}/sections/${sectionID}`,
+      {
+        method: "PATCH",
+        credentials: "include",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(payload),
+      },
+    );
+    if (!res.ok) {
+      console.warn("section PATCH failed", res.status, sectionID);
+      return;
+    }
+    const updated = await res.json() as SubmissionSectionJSON;
+    // Splice the updated row into state.view.sections. Don't re-paint
+    // unless we need to (avoid focus stealing during active typing).
+    if (state.view && state.view.sections) {
+      const idx = state.view.sections.findIndex(s => s.id === sectionID);
+      if (idx >= 0) state.view.sections[idx] = updated;
+    }
+    // Only repaint when the change has visible UI knock-on (toggle,
+    // label, order). content_md_* changes don't need a repaint —
+    // the editor already shows the lawyer's keystrokes.
+    if ("included" in payload || "label_de" in payload || "label_en" in payload || "order_index" in payload) {
+      paintSectionList();
+    }
+  } catch (err) {
+    console.warn("section PATCH error", err);
+  }
+}
+
 // t-paliad-261 (B) — click a substituted variable in the preview to
 // jump to the matching sidebar input. Re-wires on every paintPreview
 // since the preview HTML is replaced wholesale. The server side wraps

frontend/src/client/verfahrensablauf.ts

@@ -12,7 +12,6 @@ import { initI18n, t, tDyn, getLang, onLangChange } from "./i18n";
 import { initSidebar } from "./sidebar";
 import {
   type DeadlineResponse,
-  type Side,
   calculateDeadlines,
   escHtml,
   formatDate,
@@ -24,26 +23,45 @@ import {
 import {
   attachEventCardChoices,
   reseedChips,
-  currentChoices,
   type EventChoice,
-  type ChoiceKind,
 } from "./views/event-card-choices";
+import {
+  APPEAL_TARGETS,
+  SCENARIO_KEYS,
+  type AppealTarget,
+  type Side,
+  type StorageLike,
+  applyFiltersToSearch,
+  makeMemoryStorage,
+  parseAppealTargetFromSearch,
+  parseProceedingFromSearch,
+  parseSideFromSearch,
+  parseTriggerDateFromSearch,
+  readBoolFlag,
+  readCourtId,
+  readEventChoices,
+  writeBoolFlag,
+  writeCourtId,
+  writeEventChoices,
+} from "./views/verfahrensablauf-state";
 
 let selectedType = "";
 let lastResponse: DeadlineResponse | null = null;
 
-// Perspective state (t-paliad-250 / m/paliad#81). URL-driven so the
-// view is shareable and survives reload:
-//   ?side=claimant|defendant      → swaps which column owns the user's
-//                                    side (proactive vs reactive label).
-//                                    Default null = claimant-on-the-left.
-//   ?appellant=claimant|defendant → collapses party=both rows into the
-//                                    appellant's column (no mirror).
-//                                    Only meaningful for role-swap
-//                                    proceedings (Appeal etc.). Default
-//                                    null = legacy mirror behaviour.
+// Perspective state. URL-driven so the view is shareable + survives
+// reload:
+//   ?side=claimant|defendant — swaps which column owns the user's
+//                              side (proactive vs reactive label).
+//                              Default null = claimant-on-the-left.
+//
+// t-paliad-301 / m/paliad#132 collapsed the duplicate ?side= +
+// ?appellant= selectors into the single proactive-side picker above.
+// For role-swap proceedings (Appeal / EPA Opposition / DE Revision /
+// DPMA Appeal) the picker's labels swap to per-proceeding role
+// strings (Berufungskläger / Berufungsbeklagter, …) via ROLE_LABELS
+// below — but the underlying claimant/defendant value the engine
+// consumes is unchanged.
 let currentSide: Side = null;
-let currentAppellant: Side = null;
 
 // Project-driven auto-fill state (t-paliad-279 / m/paliad#111). When the
 // page is opened with ?project=<id> and that project has our_side set,
@@ -52,19 +70,21 @@ let currentAppellant: Side = null;
 // link, which clears this flag (radio cluster takes over again).
 let sidePrefilledFromProject = false;
 
-// Proceedings where one party initiates and "both" rows are role-swap
-// (i.e. either party files depending on who acted at the lower
-// instance). For these proceedings the appellant selector is meaningful
-// — when set, "both" rows collapse to a single row in the appellant's
-// column. For first-instance proceedings (Inf, Rev, …) the selector is
-// hidden because there's no appellant axis.
+// Role-swap proceedings — the side picker doubles as the appellant
+// axis. After t-paliad-301 collapsed the duplicate selectors, the
+// engine reads "appellant" from the single side value for these
+// proceedings (so a row with primary_party=both renders only in the
+// chosen side's column). For first-instance proceedings (Inf, Rev,
+// …) the side picker still narrows columns but doesn't collapse
+// the "both" rows.
 //
-// Today: every upc.apl.* family member plus dpma.appeal.* and
-// de.inf.olg / de.inf.bgh / de.null.bgh (DE Berufung / Revision).
-// Conservative — false negatives just hide a control; false positives
-// would show an irrelevant control.
+// upc.apl.unified is NOT in this set since t-paliad-307: appeal
+// timelines route via per-rule appealRole (engine-stamped under
+// appeal_target) instead of the page-level appellant axis collapse.
+// Adding upc.apl.unified here would short-circuit the appealAware
+// path and re-introduce the dead side selector on upc.apl.unified
+// (m/paliad#136 Bug 1).
 const APPELLANT_AXIS_PROCEEDINGS = new Set([
-  "upc.apl.unified",
   "de.inf.olg",
   "de.inf.bgh",
   "de.null.bgh",
@@ -73,25 +93,55 @@ const APPELLANT_AXIS_PROCEEDINGS = new Set([
   "epa.opp.boa",
 ]);
 
+// Per-proceeding role labels (t-paliad-301 / m/paliad#132 Bug A).
+// Mirrors paliad.proceeding_types.role_*_label_* — the canonical
+// definition lives in the DB; this map is the frontend's view of
+// it. Proceedings absent from the map fall back to the generic
+// "deadlines.side.claimant" / "deadlines.side.defendant" i18n keys.
+//
+// Keep in sync with mig 137's backfill. Adding a row here without a
+// matching DB row is fine (the DB col is NULL → still falls back to
+// default; UI shows the override). Adding to the DB without here
+// means the UI uses defaults — harmless but inconsistent.
+type RoleLabels = { proDE: string; reDE: string; proEN: string; reEN: string };
+const ROLE_LABELS: Record<string, RoleLabels> = {
+  "upc.apl.unified": {
+    proDE: "Berufungskläger",
+    reDE:  "Berufungsbeklagter",
+    proEN: "Appellant",
+    reEN:  "Appellee",
+  },
+  "upc.rev.cfi": {
+    proDE: "Antragsteller (Nichtigkeit)",
+    reDE:  "Antragsgegner (Nichtigkeit)",
+    proEN: "Revocation claimant",
+    reEN:  "Revocation defendant",
+  },
+  "epa.opp.opd": {
+    proDE: "Einsprechende(r)",
+    reDE:  "Patentinhaber(in)",
+    proEN: "Opponent",
+    reEN:  "Patentee",
+  },
+  "epa.opp.boa": {
+    proDE: "Einsprechende(r)",
+    reDE:  "Patentinhaber(in)",
+    proEN: "Opponent",
+    reEN:  "Patentee",
+  },
+};
+
 // Slice B1 (m/paliad#124 §18.1) — Berufung unification.
 // Proceedings that surface the appeal-target chip group. Currently
 // only the unified upc.apl proceeding; future variants (e.g. de.apl)
 // can opt in by adding the code here.
+//
+// APPEAL_TARGETS itself lives in ./views/verfahrensablauf-state so the
+// pure URL parser and this page share the same canonical list.
 const APPEAL_TARGET_PROCEEDINGS = new Set([
   "upc.apl.unified",
 ]);
 
-// Five canonical appeal-target slugs (lp.AppealTargets — keep ordered
-// in sync with pkg/litigationplanner/types.go AppealTargets).
-const APPEAL_TARGETS = [
-  "endentscheidung",
-  "kostenentscheidung",
-  "anordnung",
-  "schadensbemessung",
-  "bucheinsicht",
-] as const;
-type AppealTarget = (typeof APPEAL_TARGETS)[number] | "";
-
 function hasAppealTarget(proceedingType: string): boolean {
   return APPEAL_TARGET_PROCEEDINGS.has(proceedingType);
 }
@@ -100,48 +150,62 @@ function hasAppellantAxis(proceedingType: string): boolean {
   return APPELLANT_AXIS_PROCEEDINGS.has(proceedingType);
 }
 
-function readSideFromURL(): Side {
-  const raw = new URLSearchParams(window.location.search).get("side");
-  return raw === "claimant" || raw === "defendant" ? raw : null;
-}
+// Scenario storage — real localStorage in the browser, in-memory
+// fallback when localStorage throws (private mode, disabled storage,
+// etc.). All scenario writes go through this single handle so a
+// failure mode is isolated to one try/catch path.
+const scenarioStorage: StorageLike = makeScenarioStorage();
 
-function readAppellantFromURL(): Side {
-  const raw = new URLSearchParams(window.location.search).get("appellant");
-  return raw === "claimant" || raw === "defendant" ? raw : null;
-}
-
-function writeSideToURL(s: Side) {
-  const url = new URL(window.location.href);
-  if (s === null) url.searchParams.delete("side");
-  else url.searchParams.set("side", s);
-  window.history.replaceState(null, "", url.pathname + (url.search ? url.search : "") + url.hash);
-}
-
-function writeAppellantToURL(a: Side) {
-  const url = new URL(window.location.href);
-  if (a === null) url.searchParams.delete("appellant");
-  else url.searchParams.set("appellant", a);
-  window.history.replaceState(null, "", url.pathname + (url.search ? url.search : "") + url.hash);
-}
-
-// Slice B1 — appeal-target URL state. Empty string = no target picked
-// (the row is hidden because the proceeding isn't an appeal). Any
-// other value must be one of APPEAL_TARGETS; unknown values are
-// rejected by readAppealTargetFromURL so a stale link can't break
-// the engine filter.
-function readAppealTargetFromURL(): AppealTarget {
-  const raw = new URLSearchParams(window.location.search).get("target") || "";
-  if ((APPEAL_TARGETS as readonly string[]).includes(raw)) {
-    return raw as AppealTarget;
+function makeScenarioStorage(): StorageLike {
+  try {
+    const probe = "__paliad_va_probe__";
+    window.localStorage.setItem(probe, "1");
+    window.localStorage.removeItem(probe);
+    return window.localStorage;
+  } catch {
+    return makeMemoryStorage();
   }
-  return "";
 }
 
-function writeAppealTargetToURL(t: AppealTarget) {
+// URL writers — all four chip params route through this single helper
+// so the canonical query-string shape (no empty values, no trailing
+// `?`) is enforced in one place.
+function applyURLFilters(filters: {
+  proceeding?: string;
+  side?: Side;
+  target?: AppealTarget;
+  triggerDate?: string;
+}): void {
   const url = new URL(window.location.href);
-  if (t === "") url.searchParams.delete("target");
-  else url.searchParams.set("target", t);
-  window.history.replaceState(null, "", url.pathname + (url.search ? url.search : "") + url.hash);
+  const nextSearch = applyFiltersToSearch(url.search, filters);
+  window.history.replaceState(null, "", url.pathname + nextSearch + url.hash);
+}
+
+// t-paliad-301 / m/paliad#132: applies ROLE_LABELS to the side-row
+// radio labels for the currently selected proceeding. Proceedings
+// without an entry fall back to the existing
+// "deadlines.side.claimant" / "deadlines.side.defendant" i18n keys.
+function applyRoleLabels(proceedingType: string) {
+  const lang = getLang() === "en" ? "en" : "de";
+  const claimantSpan = document.querySelector<HTMLElement>(
+    "input[type=radio][name=side][value=claimant] + span"
+  );
+  const defendantSpan = document.querySelector<HTMLElement>(
+    "input[type=radio][name=side][value=defendant] + span"
+  );
+  if (!claimantSpan || !defendantSpan) return;
+
+  const labels = ROLE_LABELS[proceedingType];
+  if (labels) {
+    claimantSpan.textContent = lang === "en" ? labels.proEN : labels.proDE;
+    defendantSpan.textContent = lang === "en" ? labels.reEN : labels.reDE;
+  } else {
+    // Default — let i18n drive via data-i18n attribute. Reset to the
+    // canonical i18n value so a previous override doesn't stick when
+    // switching from upc.apl.unified back to upc.inf.cfi.
+    claimantSpan.textContent = t("deadlines.side.claimant");
+    defendantSpan.textContent = t("deadlines.side.defendant");
+  }
 }
 
 // Default target on first picker entry into upc.apl. m: Endentscheidung
@@ -160,54 +224,18 @@ const anchorOverrides = new Map<string, string>();
 function clearAnchorOverrides() { anchorOverrides.clear(); }
 
 // Per-event-card choices (t-paliad-265). Unbound on this page (no
-// project context), so persistence is URL-only via `?event_choices=`.
-// Format: comma-separated `submission_code:kind=value` tuples. Same
-// idiom as `?side=` + `?appellant=`.
-let perCardChoices: EventChoice[] = [];
+// project context). Persistence moved from URL → localStorage under
+// SCENARIO_KEYS.eventChoices (t-paliad-308 / m/paliad#137) — these
+// are per-user scenario tweaks, not the timeline kind, so a shared
+// link should NOT leak them into the recipient's view.
+let perCardChoices: EventChoice[] = readEventChoices(scenarioStorage);
 
-function readChoicesFromURL(): EventChoice[] {
-  const raw = new URLSearchParams(window.location.search).get("event_choices");
-  if (!raw) return [];
-  const out: EventChoice[] = [];
-  for (const tuple of raw.split(",")) {
-    const m = tuple.match(/^([^:]+):([^=]+)=(.+)$/);
-    if (!m) continue;
-    const kind = m[2] as ChoiceKind;
-    if (kind !== "appellant" && kind !== "include_ccr" && kind !== "skip") continue;
-    out.push({ submission_code: m[1], choice_kind: kind, choice_value: m[3] });
-  }
-  return out;
-}
-
-function writeChoicesToURL(choices: EventChoice[]) {
-  const url = new URL(window.location.href);
-  if (choices.length === 0) {
-    url.searchParams.delete("event_choices");
-  } else {
-    const enc = choices.map((c) => `${c.submission_code}:${c.choice_kind}=${c.choice_value}`).join(",");
-    url.searchParams.set("event_choices", enc);
-  }
-  window.history.replaceState(null, "", url.pathname + (url.search ? url.search : "") + url.hash);
-}
-
-// Show-hidden toggle state (t-paliad-290 / m/paliad#122). When ON, the
+// Show-hidden toggle (t-paliad-290 / m/paliad#122). When ON, the
 // calculator re-surfaces cards whose submission_code is in the active
 // skipRules set; they render faded with a "Wieder einblenden" chip.
-// URL-driven via ?show_hidden=1 so a shared link or reload preserves
-// the visibility. Default OFF — m's not asking to see hidden by
-// default, just to be able to.
-function readShowHiddenFromURL(): boolean {
-  return new URLSearchParams(window.location.search).get("show_hidden") === "1";
-}
-
-function writeShowHiddenToURL(on: boolean) {
-  const url = new URL(window.location.href);
-  if (on) url.searchParams.set("show_hidden", "1");
-  else url.searchParams.delete("show_hidden");
-  window.history.replaceState(null, "", url.pathname + (url.search ? url.search : "") + url.hash);
-}
-
-let showHidden = readShowHiddenFromURL();
+// Persistence moved from URL → localStorage (t-paliad-308) — it's a
+// per-user UX preference, not scenario state worth sharing in a link.
+let showHidden = readBoolFlag(scenarioStorage, SCENARIO_KEYS.showHidden);
 
 type ProcedureView = "timeline" | "columns";
 let procedureView: ProcedureView = "columns";
@@ -448,7 +476,18 @@ function renderResults(data: DeadlineResponse) {
         showNotes,
         showDurations,
         side: currentSide,
-        appellant: hasAppellantAxis(selectedType) ? currentAppellant : null,
+        // t-paliad-301: the appellant axis collapses into the single
+        // side picker. For role-swap proceedings, currentSide IS the
+        // appellant pick (so a row with primary_party=both renders only
+        // in the picked side's column). For non-role-swap proceedings,
+        // the appellant axis is irrelevant — pass null.
+        appellant: hasAppellantAxis(selectedType) ? currentSide : null,
+        // Appeal-target proceedings get per-rule appealRole routing
+        // instead of the page-level appellant collapse, so the side
+        // selector actually splits Berufungskläger vs Berufungs-
+        // beklagter filings across columns. (t-paliad-307 /
+        // m/paliad#136 Bug 1)
+        appealAware: hasAppealTarget(selectedType),
       })
     : renderTimelineBody(data, { showParty: true, editable: true, showNotes, showDurations });
 
@@ -500,7 +539,7 @@ function syncInfAmendEnabled() {
   if (!ccr.checked) infAmend.checked = false;
 }
 
-function selectProceeding(btn: HTMLButtonElement) {
+function selectProceeding(btn: HTMLButtonElement, opts: { writeURL?: boolean } = {}) {
   document.querySelectorAll(".proceeding-btn").forEach((b) => b.classList.remove("active"));
   btn.classList.add("active");
   const nextType = btn.dataset.code || "";
@@ -510,37 +549,76 @@ function selectProceeding(btn: HTMLButtonElement) {
   if (selectedType !== nextType) clearAnchorOverrides();
   selectedType = nextType;
 
+  // Persist the picked proceeding to ?proceeding= so a refresh / shared
+  // link reproduces the same tile. writeURL=false on the load-time
+  // hydration path so we don't churn history.replaceState when the
+  // URL already carries the canonical value.
+  if (opts.writeURL !== false) {
+    applyURLFilters({ proceeding: selectedType });
+  }
+
   // Trigger-event label fires from the calc response (root rule).
   // Until step 3 renders, fall back to an em-dash placeholder.
   lastResponse = null;
   syncTriggerEventLabel();
 
-  void populateCourtPicker("court-picker-row", "court-picker", selectedType);
   syncFlagRows();
-  syncAppellantRowVisibility();
   syncAppealTargetRowVisibility();
+  applyRoleLabels(selectedType);
+  // Restore flags from localStorage BEFORE the initial calc so the
+  // first /api/tools/fristenrechner POST already carries the user's
+  // stored flag state. Court_id is async (populateCourtPicker fetches
+  // courts from the API) so it restores via the .then() below + a
+  // follow-up recalc when the picker is ready.
+  restoreFlagsForProceeding();
 
   setProceedingPickerCollapsed(true, proceedingDisplayName(btn));
 
   showStep(2);
   scheduleCalc(0);
+
+  void populateCourtPicker("court-picker-row", "court-picker", selectedType).then(() => {
+    if (restoreCourtForProceeding()) scheduleCalc(0);
+  });
 }
 
-// syncAppellantRowVisibility hides the appellant selector for
-// proceedings that have no appellant axis (first-instance Inf, Rev,
-// …). Clears the in-memory state and the URL param when hidden so a
-// shared link with ?appellant= doesn't leak into an unrelated
-// proceeding's render.
-function syncAppellantRowVisibility() {
-  const row = document.getElementById("appellant-row");
-  if (!row) return;
-  const visible = hasAppellantAxis(selectedType);
-  row.style.display = visible ? "" : "none";
-  if (!visible && currentAppellant !== null) {
-    currentAppellant = null;
-    writeAppellantToURL(null);
-    syncRadioGroup("appellant", "");
+// restoreFlagsForProceeding seeds the proceeding-specific flag
+// checkboxes from localStorage. Mirrors syncFlagRows in scope — only
+// flags currently visible for the active proceeding are meaningful
+// (the hidden checkboxes still write to localStorage if toggled, but
+// that's impossible because they're not in the DOM as visible
+// controls). syncInfAmendEnabled enforces the upc.inf.cfi inf-amend
+// gating after the restore.
+function restoreFlagsForProceeding(): void {
+  const flagPairs: Array<[string, string]> = [
+    ["ccr-flag",       SCENARIO_KEYS.ccr],
+    ["inf-amend-flag", SCENARIO_KEYS.infAmend],
+    ["rev-amend-flag", SCENARIO_KEYS.revAmend],
+    ["rev-cci-flag",   SCENARIO_KEYS.revCci],
+  ];
+  for (const [domId, storageKey] of flagPairs) {
+    const cb = document.getElementById(domId) as HTMLInputElement | null;
+    if (!cb) continue;
+    cb.checked = readBoolFlag(scenarioStorage, storageKey);
   }
+  syncInfAmendEnabled();
+}
+
+// restoreCourtForProceeding tries to apply the localStorage court_id
+// to the picker after populateCourtPicker resolves. Returns true iff
+// a value actually changed (so the caller can schedule a follow-up
+// calc). Skips silently when the picker is hidden, the stored ID isn't
+// in the options list (court rotated since last visit), or the picker
+// already happens to be on the stored value.
+function restoreCourtForProceeding(): boolean {
+  const courtPicker = document.getElementById("court-picker") as HTMLSelectElement | null;
+  const storedCourtId = readCourtId(scenarioStorage);
+  if (!courtPicker || !storedCourtId) return false;
+  const has = Array.from(courtPicker.options).some((o) => o.value === storedCourtId);
+  if (!has) return false;
+  if (courtPicker.value === storedCourtId) return false;
+  courtPicker.value = storedCourtId;
+  return true;
 }
 
 // Slice B1 (m/paliad#124 §18.1) — Berufung unification.
@@ -555,7 +633,7 @@ function syncAppealTargetRowVisibility() {
   row.style.display = visible ? "" : "none";
   if (!visible && currentAppealTarget !== "") {
     currentAppealTarget = "";
-    writeAppealTargetToURL("");
+    applyURLFilters({ target: "" });
     syncRadioGroup("appeal-target", "endentscheidung");
   }
 }
@@ -669,11 +747,11 @@ function showSideRadioCluster() {
 // already chosen and we never overwrite. When we do prefill, write the
 // derived side to the URL so reload + back/forward round-trip cleanly.
 function applySidePrefill(os: ProjectOurSide["our_side"] | undefined) {
-  if (readSideFromURL() !== null) return;
+  if (parseSideFromSearch(window.location.search) !== null) return;
   const next = ourSideToSide(os);
   if (next === null) return;
   currentSide = next;
-  writeSideToURL(next);
+  applyURLFilters({ side: next });
   syncRadioGroup("side", next);
   sidePrefilledFromProject = true;
   renderSideChip(next);
@@ -742,11 +820,9 @@ function initViewToggle() {
 // /api/tools/fristenrechner round-trip — perspective is a pure
 // projection of the last response, no backend involved.
 function initPerspectiveControls() {
-  currentSide = readSideFromURL();
-  currentAppellant = readAppellantFromURL();
-  currentAppealTarget = readAppealTargetFromURL();
+  currentSide = parseSideFromSearch(window.location.search);
+  currentAppealTarget = parseAppealTargetFromSearch(window.location.search);
   syncRadioGroup("side", currentSide ?? "");
-  syncRadioGroup("appellant", currentAppellant ?? "");
   syncRadioGroup("appeal-target", currentAppealTarget || "endentscheidung");
   syncSideHintVisibility();
 
@@ -755,22 +831,12 @@ function initPerspectiveControls() {
       if (!input.checked) return;
       const v = input.value;
       currentSide = (v === "claimant" || v === "defendant") ? v : null;
-      writeSideToURL(currentSide);
+      applyURLFilters({ side: currentSide });
       syncSideHintVisibility();
       if (lastResponse) renderResults(lastResponse);
     });
   });
 
-  document.querySelectorAll<HTMLInputElement>("input[type=radio][name=appellant]").forEach((input) => {
-    input.addEventListener("change", () => {
-      if (!input.checked) return;
-      const v = input.value;
-      currentAppellant = (v === "claimant" || v === "defendant") ? v : null;
-      writeAppellantToURL(currentAppellant);
-      if (lastResponse) renderResults(lastResponse);
-    });
-  });
-
   // Slice B1 (m/paliad#124 §18.1) — appeal-target chip handler.
   // Each chip change re-fetches with the new target slug so the
   // timeline re-renders against the matching rule subset.
@@ -783,7 +849,7 @@ function initPerspectiveControls() {
       } else {
         currentAppealTarget = "";
       }
-      writeAppealTargetToURL(currentAppealTarget);
+      applyURLFilters({ target: currentAppealTarget });
       scheduleCalc(0);
     });
   });
@@ -805,28 +871,57 @@ document.addEventListener("DOMContentLoaded", () => {
 
   const dateInput = document.getElementById("trigger-date") as HTMLInputElement | null;
   if (dateInput) {
-    dateInput.addEventListener("change", () => scheduleCalc());
-    dateInput.addEventListener("input", () => scheduleCalc());
+    // Hydrate trigger_date from URL on first paint so a refresh /
+    // shared link reproduces the same dated timeline. URL wins over
+    // the verfahrensablauf.tsx today-default that the <input> renders
+    // with. parseTriggerDateFromSearch validates the shape so a
+    // malformed link silently falls back to the today-default.
+    const urlDate = parseTriggerDateFromSearch(window.location.search);
+    if (urlDate) dateInput.value = urlDate;
+    const persistDate = () => {
+      applyURLFilters({ triggerDate: dateInput.value });
+    };
+    dateInput.addEventListener("change", () => { persistDate(); scheduleCalc(); });
+    dateInput.addEventListener("input", () => { persistDate(); scheduleCalc(); });
     dateInput.addEventListener("keydown", (e) => {
-      if ((e as KeyboardEvent).key === "Enter") scheduleCalc(0);
+      if ((e as KeyboardEvent).key === "Enter") { persistDate(); scheduleCalc(0); }
     });
   }
 
   const courtPicker = document.getElementById("court-picker") as HTMLSelectElement | null;
-  if (courtPicker) courtPicker.addEventListener("change", () => scheduleCalc(0));
+  if (courtPicker) courtPicker.addEventListener("change", () => {
+    writeCourtId(scenarioStorage, courtPicker.value);
+    scheduleCalc(0);
+  });
 
   // Flag-checkbox listeners — each flip triggers a fresh calc so the
   // timeline re-projects with the new gating. ccr-flag additionally
-  // enables/disables the nested inf-amend row.
+  // enables/disables the nested inf-amend row. Each flip also writes
+  // through to localStorage so the choice survives a reload (URL stays
+  // clean; flags are scenario state, not filter chips — t-paliad-308).
   const ccrFlag = document.getElementById("ccr-flag") as HTMLInputElement | null;
   if (ccrFlag) ccrFlag.addEventListener("change", () => {
+    writeBoolFlag(scenarioStorage, SCENARIO_KEYS.ccr, ccrFlag.checked);
     syncInfAmendEnabled();
+    // Disabling ccr also unchecks inf-amend (see syncInfAmendEnabled).
+    // Mirror that into storage so the next reload doesn't repopulate a
+    // disabled checkbox as checked.
+    const infAmend = document.getElementById("inf-amend-flag") as HTMLInputElement | null;
+    if (infAmend) writeBoolFlag(scenarioStorage, SCENARIO_KEYS.infAmend, infAmend.checked);
     scheduleCalc(0);
   });
-  (["inf-amend-flag", "rev-amend-flag", "rev-cci-flag"]).forEach((id) => {
+  const flagStorageKeys: Record<string, string> = {
+    "inf-amend-flag": SCENARIO_KEYS.infAmend,
+    "rev-amend-flag": SCENARIO_KEYS.revAmend,
+    "rev-cci-flag":   SCENARIO_KEYS.revCci,
+  };
+  for (const [id, storageKey] of Object.entries(flagStorageKeys)) {
     const cb = document.getElementById(id) as HTMLInputElement | null;
-    if (cb) cb.addEventListener("change", () => scheduleCalc(0));
-  });
+    if (cb) cb.addEventListener("change", () => {
+      writeBoolFlag(scenarioStorage, storageKey, cb.checked);
+      scheduleCalc(0);
+    });
+  }
 
   document.getElementById("fristen-print-btn")?.addEventListener("click", () => window.print());
 
@@ -870,16 +965,17 @@ document.addEventListener("DOMContentLoaded", () => {
     });
   }
 
-  // t-paliad-290 — show-hidden toggle. Hydrate from URL, wire change
-  // to URL + recalc (the backend reshapes the response — we can't just
-  // re-render lastResponse since the hidden rows aren't in it when the
-  // toggle was OFF).
+  // t-paliad-290 — show-hidden toggle. Hydrated from localStorage at
+  // module load (showHidden); each flip writes back to localStorage
+  // and triggers a recalc (the backend reshapes the response — we
+  // can't just re-render lastResponse since the hidden rows aren't
+  // in it when the toggle was OFF).
   const showHiddenCb = document.getElementById("show-hidden-toggle") as HTMLInputElement | null;
   if (showHiddenCb) {
     showHiddenCb.checked = showHidden;
     showHiddenCb.addEventListener("change", () => {
       showHidden = showHiddenCb.checked;
-      writeShowHiddenToURL(showHidden);
+      writeBoolFlag(scenarioStorage, SCENARIO_KEYS.showHidden, showHidden);
       scheduleCalc(0);
     });
   }
@@ -887,11 +983,10 @@ document.addEventListener("DOMContentLoaded", () => {
   initViewToggle();
   initPerspectiveControls();
 
-  // t-paliad-265 — per-event-card choices. Unbound surface, so commits
-  // mutate the in-memory list + URL, then trigger a recalc. The
-  // popover module owns the popover lifecycle; this page owns the
-  // recalc + URL plumbing.
-  perCardChoices = readChoicesFromURL();
+  // t-paliad-265 — per-event-card choices. Unbound surface; persistence
+  // is localStorage-only (t-paliad-308) so a shared link doesn't carry
+  // the recipient's per-card tweaks. The popover module owns the
+  // popover lifecycle; this page owns the recalc + storage plumbing.
   const timelineEl = document.getElementById("timeline-container");
   if (timelineEl) {
     attachEventCardChoices({
@@ -902,14 +997,14 @@ document.addEventListener("DOMContentLoaded", () => {
           (c) => !(c.submission_code === choice.submission_code && c.choice_kind === choice.choice_kind),
         );
         perCardChoices.push(choice);
-        writeChoicesToURL(perCardChoices);
+        writeEventChoices(scenarioStorage, perCardChoices);
         scheduleCalc(0);
       },
       remove: (submissionCode, kind) => {
         perCardChoices = perCardChoices.filter(
           (c) => !(c.submission_code === submissionCode && c.choice_kind === kind),
         );
-        writeChoicesToURL(perCardChoices);
+        writeEventChoices(scenarioStorage, perCardChoices);
         scheduleCalc(0);
       },
     });
@@ -945,8 +1040,31 @@ document.addEventListener("DOMContentLoaded", () => {
     syncTriggerEventLabel();
   });
 
-  // Pre-select the first proceeding tile so users see a timeline
-  // immediately on landing — matches /tools/fristenrechner behaviour.
-  const firstBtn = document.querySelector<HTMLButtonElement>(".proceeding-btn");
-  if (firstBtn) selectProceeding(firstBtn);
+  // Pre-select the proceeding tile. URL wins: if ?proceeding= is set
+  // and points at a known tile, that tile is selected without rewriting
+  // the URL. Otherwise fall back to the first tile so users see a
+  // timeline immediately on landing — matches /tools/fristenrechner
+  // behaviour. The auto-pick does NOT write the URL so the default
+  // landing stays clean (`?proceeding=` only appears once the user
+  // makes an explicit choice). (t-paliad-308 / m/paliad#137)
+  const urlProceeding = parseProceedingFromSearch(window.location.search);
+  let initialBtn: HTMLButtonElement | null = null;
+  let urlHit = false;
+  if (urlProceeding) {
+    initialBtn = document.querySelector<HTMLButtonElement>(
+      `.proceeding-btn[data-code="${urlProceeding.replace(/"/g, '\\"')}"]`,
+    );
+    urlHit = initialBtn !== null;
+  }
+  if (!initialBtn) {
+    initialBtn = document.querySelector<HTMLButtonElement>(".proceeding-btn");
+  }
+  if (initialBtn) {
+    // writeURL=false when the URL either already carries this code
+    // (no churn) or has no proceeding (auto-default → don't pollute
+    // the clean URL). Only an unknown / stale ?proceeding= triggers
+    // a rewrite so the URL converges on the resolved tile.
+    const writeURL = urlProceeding !== "" && !urlHit;
+    selectProceeding(initialBtn, { writeURL });
+  }
 });

frontend/src/client/views/verfahrensablauf-core.test.ts

@@ -4,7 +4,9 @@ import {
   type DeadlineResponse,
   bucketDeadlinesIntoColumns,
   deadlineCardHtml,
+  formatDurationLabel,
   renderColumnsBody,
+  stripLeadingDurationFromNotes,
 } from "./verfahrensablauf-core";
 
 // Regression tests for the editable→click-to-edit wiring on timeline date
@@ -327,6 +329,29 @@ describe("bucketDeadlinesIntoColumns — side+appellant column routing (m/paliad
     expect(rows[0].ours).toHaveLength(0);
   });
 
+  test("side=defendant collapses 'both' rules into ours (no mirror) — m/paliad#135", () => {
+    // When the user has committed to a perspective via `?side=`, the
+    // mirror is visual noise: the same card renders twice on one row,
+    // once in 'Unsere Seite' and once in 'Gegnerseite'. The card's
+    // '↔ beide Seiten' indicator already conveys the both-parties
+    // semantic, so collapsing into ours is sufficient.
+    const rows = bucketDeadlinesIntoColumns(
+      [both("Antrag auf Simultanübersetzung", "2026-04-27")],
+      { side: "defendant" },
+    );
+    expect(rows[0].ours.map((d) => d.name)).toEqual(["Antrag auf Simultanübersetzung"]);
+    expect(rows[0].opponent).toHaveLength(0);
+  });
+
+  test("side=claimant collapses 'both' rules into ours (no mirror) — m/paliad#135", () => {
+    const rows = bucketDeadlinesIntoColumns(
+      [both("Antrag auf Simultanübersetzung", "2026-04-27")],
+      { side: "claimant" },
+    );
+    expect(rows[0].ours.map((d) => d.name)).toEqual(["Antrag auf Simultanübersetzung"]);
+    expect(rows[0].opponent).toHaveLength(0);
+  });
+
   test("rows align across columns by dueDate so same-day events stay on one grid row", () => {
     const sameDate = "2026-07-23";
     const rows = bucketDeadlinesIntoColumns([
@@ -464,3 +489,287 @@ describe("renderColumnsBody — side-aware column header labels (m/paliad#127)",
     expect(html).not.toContain(">Reaktiv<");
   });
 });
+
+// t-paliad-307 / m/paliad#136 Bug 1 — appeal-aware column routing.
+// All appeal rules carry party='both' (either side could be the
+// appellant). With appealAware=true + dl.appealRole set, the bucketer
+// routes by (filer matches user) instead of collapsing every 'both'
+// row into the user's column. Without a side picked, the bucketer
+// keeps the legacy mirror so every appeal rule is visible.
+describe("bucketDeadlinesIntoColumns — appeal-aware routing (t-paliad-307)", () => {
+  const appeal = (
+    name: string,
+    role: "appellant" | "appellee",
+    due: string,
+  ): CalculatedDeadline => ({
+    code: name,
+    name,
+    nameEN: name,
+    party: "both",
+    priority: "mandatory",
+    ruleRef: "",
+    dueDate: due,
+    originalDate: due,
+    wasAdjusted: false,
+    isRootEvent: false,
+    isCourtSet: false,
+    appealRole: role,
+  });
+
+  const notice = appeal("Berufungseinlegung", "appellant", "2026-07-26");
+  const grounds = appeal("Berufungsbegründung", "appellant", "2026-09-26");
+  const response = appeal("Berufungserwiderung", "appellee", "2026-12-26");
+
+  test("appealAware + side=claimant: appellant rules → ours, appellee rules → opponent", () => {
+    const rows = bucketDeadlinesIntoColumns([notice, grounds, response], {
+      side: "claimant",
+      appealAware: true,
+    });
+    const byKey = new Map(rows.map((r) => [r.key, r]));
+    expect(byKey.get(notice.dueDate)?.ours.map((d) => d.name)).toEqual(["Berufungseinlegung"]);
+    expect(byKey.get(notice.dueDate)?.opponent).toHaveLength(0);
+    expect(byKey.get(response.dueDate)?.ours).toHaveLength(0);
+    expect(byKey.get(response.dueDate)?.opponent.map((d) => d.name)).toEqual(["Berufungserwiderung"]);
+  });
+
+  test("appealAware + side=defendant: appellant rules → opponent, appellee rules → ours", () => {
+    const rows = bucketDeadlinesIntoColumns([notice, response], {
+      side: "defendant",
+      appealAware: true,
+    });
+    const byKey = new Map(rows.map((r) => [r.key, r]));
+    expect(byKey.get(notice.dueDate)?.opponent.map((d) => d.name)).toEqual(["Berufungseinlegung"]);
+    expect(byKey.get(notice.dueDate)?.ours).toHaveLength(0);
+    expect(byKey.get(response.dueDate)?.ours.map((d) => d.name)).toEqual(["Berufungserwiderung"]);
+    expect(byKey.get(response.dueDate)?.opponent).toHaveLength(0);
+  });
+
+  test("appealAware + side=null: mirror to both columns (every rule visible)", () => {
+    const rows = bucketDeadlinesIntoColumns([notice, response], {
+      side: null,
+      appealAware: true,
+    });
+    const byKey = new Map(rows.map((r) => [r.key, r]));
+    expect(byKey.get(notice.dueDate)?.ours.map((d) => d.name)).toEqual(["Berufungseinlegung"]);
+    expect(byKey.get(notice.dueDate)?.opponent.map((d) => d.name)).toEqual(["Berufungseinlegung"]);
+    expect(byKey.get(response.dueDate)?.ours.map((d) => d.name)).toEqual(["Berufungserwiderung"]);
+    expect(byKey.get(response.dueDate)?.opponent.map((d) => d.name)).toEqual(["Berufungserwiderung"]);
+  });
+
+  test("appealAware off: appealRole is ignored and legacy bucketing applies", () => {
+    // Regression guard: a stale frontend that drops `appealAware: true`
+    // must not silently route via appealRole — the side selector
+    // would visibly change behaviour without a UI control to opt in.
+    const rows = bucketDeadlinesIntoColumns([notice, response], { side: "defendant" });
+    // Legacy "side without appellant" collapse → both rows into ours.
+    const allOurs = rows.flatMap((r) => r.ours.map((d) => d.name));
+    expect(allOurs).toEqual(["Berufungseinlegung", "Berufungserwiderung"]);
+    rows.forEach((r) => expect(r.opponent).toHaveLength(0));
+  });
+
+  test("appealAware respects court party — court rows always route to court column", () => {
+    const decision: CalculatedDeadline = {
+      ...notice,
+      name: "Entscheidung",
+      party: "court",
+      appealRole: "", // court events deliberately stay empty
+      dueDate: "",
+    };
+    const rows = bucketDeadlinesIntoColumns([decision], { side: "claimant", appealAware: true });
+    expect(rows[0].court.map((d) => d.name)).toEqual(["Entscheidung"]);
+    expect(rows[0].ours).toHaveLength(0);
+    expect(rows[0].opponent).toHaveLength(0);
+  });
+
+  test("appealAware + rule without appealRole falls back to legacy bucketing", () => {
+    // A future appeal rule we forgot to map: appealRole='' falls
+    // through the appealAware branch and lands in the legacy
+    // side-collapse path → ours.
+    const unmapped: CalculatedDeadline = { ...notice, appealRole: "" };
+    const rows = bucketDeadlinesIntoColumns([unmapped], { side: "claimant", appealAware: true });
+    expect(rows[0].ours.map((d) => d.name)).toEqual(["Berufungseinlegung"]);
+    expect(rows[0].opponent).toHaveLength(0);
+  });
+});
+
+// t-paliad-307 / m/paliad#136 Bug 3 — duration label appends the
+// parent rule name (or the proceeding's trigger event label for
+// root rules) so the chip reads "4 Monate nach Endentscheidung"
+// instead of the dangling "4 Monate nach".
+describe("formatDurationLabel — appends parent name (t-paliad-307)", () => {
+  const dl = (overrides: Partial<CalculatedDeadline> = {}): CalculatedDeadline => ({
+    code: "x",
+    name: "x",
+    nameEN: "x",
+    party: "both",
+    priority: "mandatory",
+    ruleRef: "",
+    dueDate: "",
+    originalDate: "",
+    wasAdjusted: false,
+    isRootEvent: false,
+    isCourtSet: false,
+    durationValue: 4,
+    durationUnit: "months",
+    timing: "after",
+    ...overrides,
+  });
+
+  test("with parent label: appends to head", () => {
+    expect(formatDurationLabel(dl(), "Endentscheidung (R.118)"))
+      .toBe("4 Monate nach Endentscheidung (R.118)");
+  });
+
+  test("without parent label: bare head — caller decides whether to render", () => {
+    expect(formatDurationLabel(dl())).toBe("4 Monate nach");
+  });
+
+  test("without timing: parent is not appended (degenerate phrasing)", () => {
+    // No timing == we can't form "4 Monate <timing> <parent>" cleanly,
+    // so the bare "4 Monate" head stays. Pinned to catch a future
+    // edit that would emit "4 Monate Endentscheidung" without a
+    // preposition.
+    expect(formatDurationLabel(dl({ timing: "" }), "Endentscheidung")).toBe("4 Monate");
+  });
+
+  test("singular value: switches to .one unit key", () => {
+    expect(formatDurationLabel(dl({ durationValue: 1 }), "X")).toBe("1 Monat nach X");
+  });
+
+  test("zero / missing duration: empty string", () => {
+    expect(formatDurationLabel(dl({ durationValue: 0 }), "X")).toBe("");
+    expect(formatDurationLabel(dl({ durationValue: 0, durationUnit: "" }), "X")).toBe("");
+  });
+});
+
+describe("deadlineCardHtml — duration tooltip reads parent name (t-paliad-307)", () => {
+  test("root rule with non-zero duration uses opts.triggerEventLabel as parent fallback", () => {
+    // upc.apl.merits.notice has no parent_id but a 2-month duration
+    // off the trigger event (the appealed decision). The duration
+    // tooltip must read the appeal-target label, not just "2 Monate
+    // nach".
+    const dl: CalculatedDeadline = {
+      code: "upc.apl.merits.notice",
+      name: "Berufungseinlegung",
+      nameEN: "Notice of Appeal",
+      party: "both",
+      priority: "mandatory",
+      ruleRef: "",
+      dueDate: "2026-07-26",
+      originalDate: "2026-07-26",
+      wasAdjusted: false,
+      isRootEvent: false,
+      isCourtSet: false,
+      durationValue: 2,
+      durationUnit: "months",
+      timing: "after",
+    };
+    const html = deadlineCardHtml(dl, {
+      showParty: false,
+      editable: true,
+      triggerEventLabel: "Endentscheidung (R.118)",
+    });
+    expect(html).toContain("title=\"2 Monate nach Endentscheidung (R.118)\"");
+  });
+
+  test("non-root rule prefers parent rule name over triggerEventLabel", () => {
+    // merits.response chains off merits.grounds; the duration label
+    // should read "3 Monate nach Berufungsbegründung", not the
+    // appeal-target fallback.
+    const dl: CalculatedDeadline = {
+      code: "upc.apl.merits.response",
+      name: "Berufungserwiderung",
+      nameEN: "Response to Appeal",
+      party: "both",
+      priority: "mandatory",
+      ruleRef: "",
+      dueDate: "2026-12-26",
+      originalDate: "2026-12-26",
+      wasAdjusted: false,
+      isRootEvent: false,
+      isCourtSet: false,
+      durationValue: 3,
+      durationUnit: "months",
+      timing: "after",
+      parentRuleCode: "upc.apl.merits.grounds",
+      parentRuleName: "Berufungsbegründung",
+      parentRuleNameEN: "Statement of Grounds",
+    };
+    const html = deadlineCardHtml(dl, {
+      showParty: false,
+      editable: true,
+      triggerEventLabel: "Endentscheidung (R.118)",
+    });
+    expect(html).toContain("title=\"3 Monate nach Berufungsbegründung\"");
+  });
+});
+
+// t-paliad-307 / m/paliad#136 Bug 4 — leading "Frist N <unit> …"
+// substring is stripped before deadline_notes renders so the new
+// duration affordance and the legacy free-text don't duplicate.
+describe("stripLeadingDurationFromNotes — render-side dedup (t-paliad-307)", () => {
+  test("DE: strips 'Frist 1 Monat VOR …. ' and keeps the rest", () => {
+    const out = stripLeadingDurationFromNotes(
+      "Frist 1 Monat VOR der mündlichen Verhandlung (R.109.1). Antrag auf Simultanübersetzung.",
+      "de",
+    );
+    expect(out).toBe("Antrag auf Simultanübersetzung.");
+  });
+
+  test("DE: strips 'Frist 15 Tage ab …' when the whole notes is the duration prose", () => {
+    const out = stripLeadingDurationFromNotes(
+      "Frist 15 Tage ab Zustellung der Kostenentscheidung",
+      "de",
+    );
+    expect(out).toBe("");
+  });
+
+  test("DE: strips 'Frist beträgt 2 Monate ab …. ' (Wiedereinsetzung variant)", () => {
+    const out = stripLeadingDurationFromNotes(
+      "Frist beträgt 2 Monate ab Wegfall des Hindernisses (§ 123(2) PatG). Spätestens 1 Jahr.",
+      "de",
+    );
+    expect(out).toBe("Spätestens 1 Jahr.");
+  });
+
+  test("DE: composite 'Frist N … ODER M …' is preserved (option b follow-up)", () => {
+    const composite =
+      "Frist 31 Kalendertage ODER 20 Arbeitstage (jeweils das längere) ab Anordnung der einstweiligen Maßnahme.";
+    expect(stripLeadingDurationFromNotes(composite, "de")).toBe(composite);
+  });
+
+  test("DE: 'Frist vom Gericht' (no number) is preserved", () => {
+    const out = stripLeadingDurationFromNotes("Frist vom Gericht bestimmt", "de");
+    expect(out).toBe("Frist vom Gericht bestimmt");
+  });
+
+  test("EN: strips '1 month BEFORE …. ' and keeps the rest", () => {
+    const out = stripLeadingDurationFromNotes(
+      "1 month BEFORE the oral hearing (R.109.1). Request for simultaneous interpretation.",
+      "en",
+    );
+    expect(out).toBe("Request for simultaneous interpretation.");
+  });
+
+  test("EN: strips '15-day period from …'", () => {
+    const out = stripLeadingDurationFromNotes(
+      "15-day period from service of the cost decision",
+      "en",
+    );
+    expect(out).toBe("");
+  });
+
+  test("EN: strips 'Period is N <unit> from …'", () => {
+    const out = stripLeadingDurationFromNotes(
+      "Period is 2 months from removal of the obstacle (Rule 136(1) EPC). Latest 12 months.",
+      "en",
+    );
+    expect(out).toBe("Latest 12 months.");
+  });
+
+  test("EN: empty / non-matching notes pass through unchanged", () => {
+    expect(stripLeadingDurationFromNotes("", "en")).toBe("");
+    expect(stripLeadingDurationFromNotes("Time limit set by the court", "en"))
+      .toBe("Time limit set by the court");
+  });
+});

frontend/src/client/views/verfahrensablauf-core.ts

@@ -104,19 +104,92 @@ export interface CalculatedDeadline {
   durationValue?: number;
   durationUnit?: string;
   timing?: string;
+  // appealRole carries the rule's appeal-filer identity when the
+  // server computed the timeline under an appeal_target filter:
+  // "appellant" (Berufungskläger files this rule), "appellee"
+  // (Berufungsbeklagter files this rule), or empty for court events
+  // and non-appeal timelines. The column bucketer reads this in
+  // preference to primary_party='both' so a user-perspective `?side=`
+  // pick can split appeal filings into the user's column vs the
+  // opponent's, instead of routing every "both" rule into the
+  // user's column. (t-paliad-307 / m/paliad#136 Bug 1)
+  appealRole?: "appellant" | "appellee" | "";
+  // isTriggerEvent marks the synthetic row the engine prepends to the
+  // timeline when computing an appeal: a court-set decision dated to
+  // the trigger date with the per-appeal-target label
+  // (Endentscheidung / Kostenentscheidung / Anordnung / …). The row
+  // carries no real rule_id — it's a UI marker so the timeline reads
+  // decision → appeal filings → next decision. (t-paliad-307 /
+  // m/paliad#136 Bug 2)
+  isTriggerEvent?: boolean;
 }
 
-// formatDurationLabel renders the per-rule duration ("2 Mo. nach") for
-// the Verfahrensablauf card affordance (m/paliad#133, t-paliad-302).
-// Returns empty string for rules without a usable duration so the
-// caller can skip the tooltip / inline span entirely.
+// stripLeadingDurationFromNotes drops the leading
+// "Frist N <unit> <preposition> <subject>." (DE) /
+// "N <unit> <preposition> <subject>." (EN) prefix from a rule's
+// deadline_notes so it doesn't duplicate the new duration affordance
+// added in m/paliad#133 (t-paliad-307 Bug 4).
 //
-// Pluralisation key naming mirrors the Fristenrechner event-mode
-// renderer (deadlines.event.unit.<unit>.{one,many}) — the unit and
-// timing translations already exist for /tools/fristenrechner's
-// "Was kommt nach…" mode and are reused here as the single
-// source of truth.
-export function formatDurationLabel(dl: CalculatedDeadline): string {
+// The duration affordance now renders the same prose as a badge on
+// the card ("4 Monate nach Endentscheidung (R.118)"); a free-text
+// notes string that opens with the same prose reads as a verbatim
+// duplicate. Only the leading-prefix shape is stripped — anything
+// after the first sentence is preserved (the editorial commentary
+// the lawyers actually want to read).
+//
+// Conservative: composite-duration prefaces with "ODER" /
+// "whichever is the longer" don't match and stay untouched — those
+// are the follow-up editorial cleanup (option b in the issue brief).
+//
+// Examples:
+//   "Frist 1 Monat VOR der mündlichen Verhandlung (R.109.1). Antrag …"
+//     → "Antrag …"
+//   "Frist 15 Tage ab Zustellung der Kostenentscheidung"
+//     → ""
+//   "Frist beträgt 2 Monate ab Wegfall des Hindernisses (§ 123(2) PatG). Spätestens …"
+//     → "Spätestens …"
+//   "1-month period from service of the main decision"
+//     → ""
+//   "1 month BEFORE the oral hearing (R.109.1). Request for …"
+//     → "Request for …"
+//   "Period is 2 months from removal of the obstacle (Rule 136(1) EPC). Latest …"
+//     → "Latest …"
+//   "Frist 31 Kalendertage ODER 20 Arbeitstage (jeweils das längere) ab Anordnung …"
+//     → unchanged (composite — option b follow-up)
+export function stripLeadingDurationFromNotes(notes: string, lang: "de" | "en"): string {
+  if (!notes) return notes;
+  // Terminator `(?:\.\s+|$)` matches the FIRST sentence boundary
+  // (period followed by whitespace) OR end of input. Embedded dots
+  // inside parenthesised citations (R.109.1, § 123(2), Rule 136(1))
+  // are skipped because the char right after them isn't whitespace.
+  // `[^]*?` is the JS-portable form of `.*?` with the dotAll flag —
+  // any character including newlines, non-greedy.
+  const re = lang === "en"
+    ? /^(?:Period\s+is\s+)?\d+(?:[-\s]\S+)?\s+(?:\S+\s+)?(?:before|from|after|since)\b[^]*?(?:\.\s+|$)/i
+    : /^Frist\s+(?:beträgt\s+)?\d+\s+\S+\s+(?:VOR|vor|nach|ab|seit)\b[^]*?(?:\.\s+|$)/;
+  return notes.replace(re, "");
+}
+
+// formatDurationLabel renders the per-rule duration label for the
+// Verfahrensablauf card affordance: "2 Monate nach Endentscheidung",
+// "1 Monat vor Mündlicher Verhandlung", …
+// (m/paliad#133, t-paliad-302; parent-name append: t-paliad-307 /
+// m/paliad#136 Bug 3).
+//
+// Returns empty string for rules without a usable duration so the
+// caller can skip the tooltip / inline span entirely. Pluralisation
+// key naming mirrors the Fristenrechner event-mode renderer
+// (deadlines.event.unit.<unit>.{one,many}) — the unit and timing
+// translations already exist for /tools/fristenrechner's
+// "Was kommt nach…" mode and are reused here as the single source
+// of truth.
+//
+// `parentLabel` is the rule's anchor name (parent rule's name when
+// the rule has a parent_id; otherwise the proceeding's
+// triggerEventLabel from the wire). Empty falls back to bare
+// "<n> <unit> <timing>" — bare phrasing is the pre-fix shape and
+// remains the default for fixtures / tests that omit a parent.
+export function formatDurationLabel(dl: CalculatedDeadline, parentLabel: string = ""): string {
   const value = dl.durationValue ?? 0;
   const unit = dl.durationUnit || "";
   if (value <= 0 || !unit) return "";
@@ -124,7 +197,9 @@ export function formatDurationLabel(dl: CalculatedDeadline): string {
   const unitStr = tDyn(unitKey);
   const timing = dl.timing || "";
   const timingStr = timing ? tDyn(`deadlines.event.timing.${timing}`) : "";
-  return timingStr ? `${value} ${unitStr} ${timingStr}` : `${value} ${unitStr}`;
+  const head = timingStr ? `${value} ${unitStr} ${timingStr}` : `${value} ${unitStr}`;
+  if (!timingStr || !parentLabel) return head;
+  return `${head} ${parentLabel}`;
 }
 
 // priorityRendering returns the per-priority UX hints the save-modal
@@ -363,16 +438,34 @@ export interface CardOpts {
   // flips this and re-renders; persisted via the localStorage key
   // `paliad.verfahrensablauf.durations-show`. Default false.
   showDurations?: boolean;
+  // triggerEventLabel: per-language label of the proceeding's anchor
+  // event ("Endentscheidung (R.118)" for an Endentscheidung appeal;
+  // "Klageerhebung" for upc.inf.cfi; …). Used by formatDurationLabel
+  // as the parent-name fallback when a rule is a root rule (no
+  // parent_id) but carries a non-zero duration — e.g. the
+  // Berufungseinlegung 2 months after Endentscheidung. Pages pass the
+  // already-language-resolved string. (t-paliad-307 / m/paliad#136
+  // Bug 3)
+  triggerEventLabel?: string;
 }
 
 export function deadlineCardHtml(dl: CalculatedDeadline, opts: CardOpts): string {
   const wantsEditable = !!opts.editable;
   const editable = wantsEditable && !dl.isRootEvent && dl.code !== "";
   const overriddenClass = dl.isOverridden ? " timeline-date--overridden" : "";
+  // Parent name for the duration label (t-paliad-307 / m/paliad#136
+  // Bug 3): use the rule's parent if set, else fall back to the
+  // proceeding's trigger event label (e.g. "Endentscheidung (R.118)"
+  // for an Endentscheidung appeal; "Klageerhebung" for upc.inf.cfi).
+  // Empty for rules whose anchor isn't surface-able — the duration
+  // label degrades to the bare "<n> <unit> <timing>" form in that case.
+  const parentLabelForDuration = (getLang() === "en"
+    ? (dl.parentRuleNameEN || dl.parentRuleName)
+    : (dl.parentRuleName || dl.parentRuleNameEN)) || opts.triggerEventLabel || "";
   // Duration affordance (m/paliad#133, t-paliad-302). Computed once so
   // both the date-span tooltip and the inline meta-row span pull from
   // the same string. Empty for rules without a usable duration.
-  const durationLabel = formatDurationLabel(dl);
+  const durationLabel = formatDurationLabel(dl, parentLabelForDuration);
   // Hover affordance on the date span: prefer the duration tooltip when
   // we have one, else fall back to the edit-hint when the cell is
   // click-to-edit. The edit affordance still works either way — the
@@ -478,7 +571,14 @@ export function deadlineCardHtml(dl: CalculatedDeadline, opts: CardOpts): string
     ruleRef = `<span class="timeline-rule">${escHtml(dl.ruleRef)}</span>`;
   }
 
-  const noteText = getLang() === "en" ? (dl.notesEN || dl.notes) : dl.notes;
+  const rawNoteText = getLang() === "en" ? (dl.notesEN || dl.notes) : dl.notes;
+  // Strip the leading-duration prefix so the new duration affordance
+  // doesn't duplicate what the lawyer wrote verbatim into deadline_notes
+  // for those legacy rule rows that still carry it.
+  // (t-paliad-307 / m/paliad#136 Bug 4)
+  const noteText = rawNoteText
+    ? stripLeadingDurationFromNotes(rawNoteText, getLang() === "en" ? "en" : "de")
+    : rawNoteText;
   const showNotes = opts.showNotes === true;
   const notesBlock = noteText && showNotes
     ? `<div class="timeline-notes">${noteText}</div>`
@@ -608,7 +708,32 @@ export function wireDateEditClicks(
   });
 }
 
+// pickTriggerEventLabel returns the per-language trigger event label
+// from a DeadlineResponse, used as the parent-fallback for root-rule
+// duration labels. Mirrors the precedence the page-level
+// triggerEventLabelFor uses (curated server label > proceedingName
+// fallback). Distinct from the page helper in that it stays language-
+// scoped to the current getLang() — root-rule duration labels render
+// in the user's current language. (t-paliad-307 / m/paliad#136 Bug 3)
+export function pickTriggerEventLabel(data: DeadlineResponse): string {
+  const lang = getLang();
+  const curated = lang === "en"
+    ? (data.triggerEventLabelEN || data.triggerEventLabel || "")
+    : (data.triggerEventLabel || data.triggerEventLabelEN || "");
+  if (curated) return curated;
+  return lang === "en"
+    ? (data.proceedingNameEN || data.proceedingName || "")
+    : (data.proceedingName || data.proceedingNameEN || "");
+}
+
 export function renderTimelineBody(data: DeadlineResponse, opts: CardOpts = { showParty: true }): string {
+  // Resolve the trigger event label once so the duration affordance on
+  // root rules (no parent) can read it as the anchor fallback. Caller-
+  // provided value wins (lets the page override for sub-track flows).
+  const cardOpts: CardOpts = {
+    ...opts,
+    triggerEventLabel: opts.triggerEventLabel ?? pickTriggerEventLabel(data),
+  };
   let html = '<div class="timeline">';
   for (const dl of data.deadlines) {
     const itemClasses = [
@@ -630,7 +755,7 @@ export function renderTimelineBody(data: DeadlineResponse, opts: CardOpts = { sh
           <div class="timeline-line"></div>
         </div>
         <div class="timeline-content">
-          ${deadlineCardHtml(dl, opts)}
+          ${deadlineCardHtml(dl, cardOpts)}
         </div>
       </div>
     `;
@@ -689,6 +814,15 @@ export interface ColumnsBodyOpts {
   // (no mirror). Default null = mirror "both" into both cells
   // (legacy behaviour). Independent of `side`.
   appellant?: Side;
+  // appealAware: forwarded to bucketDeadlinesIntoColumns when the
+  // page is rendering an appeal_target-filtered timeline. Routes
+  // each rule to its filer-perspective column via dl.appealRole
+  // instead of the legacy primary_party='both' collapse.
+  // (t-paliad-307 / m/paliad#136 Bug 1)
+  appealAware?: boolean;
+  // triggerEventLabel: forwarded to deadlineCardHtml — see CardOpts.
+  // (t-paliad-307 / m/paliad#136 Bug 3)
+  triggerEventLabel?: string;
 }
 
 // ColumnsRow is the per-due-date bucket the renderer consumes. Public
@@ -704,6 +838,15 @@ export interface ColumnsRow {
 export interface BucketingOpts {
   side?: Side;
   appellant?: Side;
+  // appealAware: when true, rules carrying a `dl.appealRole` of
+  // "appellant" / "appellee" route via the appeal role + user side
+  // axis instead of the legacy primary_party='both' collapse. With
+  // `side=null` the bucketer keeps the mirror semantic (both columns
+  // render every appeal rule); with `side` set, "appellant" rules
+  // land in the user's column when the user IS the appellant, in
+  // the opponent's column otherwise — mirror for "appellee" rules.
+  // (t-paliad-307 / m/paliad#136 Bug 1)
+  appealAware?: boolean;
 }
 
 // bucketDeadlinesIntoColumns is the pure routing primitive that
@@ -738,6 +881,8 @@ export function bucketDeadlinesIntoColumns(
     return r;
   };
 
+  const appealAware = opts.appealAware === true;
+
   deadlines.forEach((dl, idx) => {
     const key = dl.dueDate || `${UNSCHEDULED_PREFIX}${String(idx).padStart(4, "0")}`;
     const row = ensureRow(key);
@@ -760,11 +905,41 @@ export function bucketDeadlinesIntoColumns(
         if (dl.appellantContext === "claimant" || dl.appellantContext === "defendant") {
           const perCardCol = dl.appellantContext === "claimant" ? claimantColumn : defendantColumn;
           row[perCardCol].push(dl);
+        } else if (
+          appealAware &&
+          (dl.appealRole === "appellant" || dl.appealRole === "appellee")
+        ) {
+          // Appeal-aware routing (t-paliad-307 / m/paliad#136 Bug 1).
+          // With no side picked, mirror to both columns so every rule
+          // is visible regardless of which side the user is on. With
+          // a side picked, route by (filer matches user) → ours
+          // column, else opponent column. side=claimant maps the
+          // user to "appellant" (Berufungskläger); side=defendant
+          // maps the user to "appellee" (Berufungsbeklagter).
+          if (userSide === null) {
+            row.ours.push(dl);
+            row.opponent.push(dl);
+          } else {
+            const userIsAppellant = userSide === "claimant";
+            const filerIsAppellant = dl.appealRole === "appellant";
+            row[filerIsAppellant === userIsAppellant ? "ours" : "opponent"].push(dl);
+          }
         } else if (appellantColumn !== null) {
           // Role-swap collapse: appellant initiated → both → one row
           // in appellant's column. Mirror suppressed.
           row[appellantColumn].push(dl);
+        } else if (userSide !== null) {
+          // Side picked but no appellant axis (first-instance Inf, Rev,
+          // …): the user has committed to a perspective, so the mirror
+          // is visual noise — the same card appears twice on the same
+          // row, once in "Unsere Seite" and once in "Gegnerseite".
+          // Collapse into ours; the "↔ beide Seiten" indicator on the
+          // card already conveys that the rule applies to both parties.
+          // (m/paliad#135 / t-paliad-304)
+          row.ours.push(dl);
         } else {
+          // No perspective picked → keep the legacy mirror so neither
+          // axis is privileged. Pinned by the "default (no opts)" test.
           row.ours.push(dl);
           row.opponent.push(dl);
         }
@@ -787,7 +962,11 @@ export function bucketDeadlinesIntoColumns(
 
 export function renderColumnsBody(data: DeadlineResponse, opts: ColumnsBodyOpts = {}): string {
   const userSide: Side = opts.side ?? null;
-  const rows = bucketDeadlinesIntoColumns(data.deadlines, { side: userSide, appellant: opts.appellant });
+  const rows = bucketDeadlinesIntoColumns(data.deadlines, {
+    side: userSide,
+    appellant: opts.appellant,
+    appealAware: opts.appealAware,
+  });
   const appellantPinned = opts.appellant === "claimant" || opts.appellant === "defendant";
 
   const cardOpts: CardOpts = {
@@ -795,12 +974,19 @@ export function renderColumnsBody(data: DeadlineResponse, opts: ColumnsBodyOpts
     editable: opts.editable,
     showNotes: opts.showNotes,
     showDurations: opts.showDurations,
+    triggerEventLabel: opts.triggerEventLabel ?? pickTriggerEventLabel(data),
   };
 
   // Collapsed "both" rows lose their mirror tag — there's no longer
   // a sibling row to mirror to, so the "↔ beide Seiten" hint would
-  // be misleading. Keep it for the legacy mirror path.
-  const showMirrorTag = !appellantPinned;
+  // be misleading. Both collapse paths suppress it:
+  //   - appellantPinned: role-swap collapse into appellant's column
+  //   - userSide !== null without appellantPinned: perspective-locked
+  //     collapse into ours (m/paliad#135 / t-paliad-304).
+  // Legacy mirror path (no side, no appellant) keeps the tag — both
+  // sibling rows still render so the tag has a visual referent.
+  const sideCollapse = userSide !== null;
+  const showMirrorTag = !appellantPinned && !sideCollapse;
 
   const renderCell = (items: CalculatedDeadline[]): string => {
     if (items.length === 0) {

frontend/src/client/views/verfahrensablauf-state.test.ts

@@ -0,0 +1,309 @@
+// Unit tests for the /tools/verfahrensablauf URL + scenario-localStorage
+// state contract (t-paliad-308 / m/paliad#137). Run with `bun test`.
+//
+// The contract:
+//   1. URL params (proceeding, side, target, trigger_date) define which
+//      timeline kind the user is looking at — paste-able, shareable,
+//      refresh-resistant.
+//   2. localStorage (paliad.verfahrensablauf.scenario.*) holds the
+//      per-user scenario tweaks (event_choices, court_id, flags,
+//      show_hidden) — these never leak into a shared link.
+//   3. On hydrate, URL wins. localStorage fills the rest.
+
+import { describe, expect, test } from "bun:test";
+import {
+  APPEAL_TARGETS,
+  SCENARIO_KEYS,
+  SCENARIO_PREFIX,
+  URL_KEYS,
+  applyFiltersToSearch,
+  hydrate,
+  makeMemoryStorage,
+  parseAppealTargetFromSearch,
+  parseProceedingFromSearch,
+  parseSideFromSearch,
+  parseTriggerDateFromSearch,
+  readBoolFlag,
+  readCourtId,
+  readEventChoices,
+  readScenario,
+  writeBoolFlag,
+  writeCourtId,
+  writeEventChoices,
+} from "./verfahrensablauf-state";
+
+describe("URL parsers — filter chips", () => {
+  test("parseProceedingFromSearch returns empty string when absent", () => {
+    expect(parseProceedingFromSearch("")).toBe("");
+    expect(parseProceedingFromSearch("?side=claimant")).toBe("");
+  });
+
+  test("parseProceedingFromSearch echoes the raw value", () => {
+    expect(parseProceedingFromSearch("?proceeding=upc.inf.cfi")).toBe("upc.inf.cfi");
+    expect(parseProceedingFromSearch("?proceeding=upc.apl.unified&side=claimant")).toBe("upc.apl.unified");
+  });
+
+  test("parseSideFromSearch validates the enum", () => {
+    expect(parseSideFromSearch("?side=claimant")).toBe("claimant");
+    expect(parseSideFromSearch("?side=defendant")).toBe("defendant");
+    expect(parseSideFromSearch("?side=neither")).toBe(null);
+    expect(parseSideFromSearch("")).toBe(null);
+  });
+
+  test("parseAppealTargetFromSearch only accepts canonical slugs", () => {
+    for (const t of APPEAL_TARGETS) {
+      expect(parseAppealTargetFromSearch(`?target=${t}`)).toBe(t);
+    }
+    expect(parseAppealTargetFromSearch("?target=unknown")).toBe("");
+    expect(parseAppealTargetFromSearch("")).toBe("");
+  });
+
+  test("parseTriggerDateFromSearch validates the ISO-date shape", () => {
+    expect(parseTriggerDateFromSearch("?trigger_date=2026-05-26")).toBe("2026-05-26");
+    expect(parseTriggerDateFromSearch("?trigger_date=2024-02-29")).toBe("2024-02-29"); // leap year
+  });
+
+  test("parseTriggerDateFromSearch rejects malformed and impossible dates", () => {
+    expect(parseTriggerDateFromSearch("?trigger_date=2026-02-30")).toBe(""); // Feb 30
+    expect(parseTriggerDateFromSearch("?trigger_date=2026-13-01")).toBe(""); // month 13
+    expect(parseTriggerDateFromSearch("?trigger_date=tomorrow")).toBe("");
+    expect(parseTriggerDateFromSearch("?trigger_date=2026-5-26")).toBe(""); // 1-digit month
+    expect(parseTriggerDateFromSearch("")).toBe("");
+  });
+});
+
+describe("URL encoder — applyFiltersToSearch", () => {
+  test("empty filters preserve the existing query string", () => {
+    expect(applyFiltersToSearch("?other=keep", {})).toBe("?other=keep");
+  });
+
+  test("setting a filter writes the canonical key", () => {
+    expect(applyFiltersToSearch("", { proceeding: "upc.inf.cfi" })).toBe("?proceeding=upc.inf.cfi");
+    expect(applyFiltersToSearch("", { side: "claimant" })).toBe("?side=claimant");
+    expect(applyFiltersToSearch("", { target: "endentscheidung" })).toBe("?target=endentscheidung");
+    expect(applyFiltersToSearch("", { triggerDate: "2026-05-26" })).toBe("?trigger_date=2026-05-26");
+  });
+
+  test("setting null / empty / undefined deletes the key", () => {
+    expect(applyFiltersToSearch("?side=claimant", { side: null })).toBe("");
+    expect(applyFiltersToSearch("?proceeding=upc.inf.cfi", { proceeding: "" })).toBe("");
+    expect(applyFiltersToSearch("?target=endentscheidung", { target: "" })).toBe("");
+    expect(applyFiltersToSearch("?trigger_date=2026-05-26", { triggerDate: "" })).toBe("");
+  });
+
+  test("invalid trigger_date is deleted (never written as-is)", () => {
+    expect(applyFiltersToSearch("?trigger_date=2026-05-26", { triggerDate: "bogus" })).toBe("");
+  });
+
+  test("setting all four filters together emits all four keys", () => {
+    const out = applyFiltersToSearch("", {
+      proceeding: "upc.apl.unified",
+      side: "defendant",
+      target: "endentscheidung",
+      triggerDate: "2026-05-26",
+    });
+    expect(out).toContain("proceeding=upc.apl.unified");
+    expect(out).toContain("side=defendant");
+    expect(out).toContain("target=endentscheidung");
+    expect(out).toContain("trigger_date=2026-05-26");
+  });
+
+  test("other params (project, view) are preserved", () => {
+    const out = applyFiltersToSearch("?project=abc&view=timeline", { side: "claimant" });
+    expect(out).toContain("project=abc");
+    expect(out).toContain("view=timeline");
+    expect(out).toContain("side=claimant");
+  });
+
+  test("absent keys in the filter object don't touch existing URL values", () => {
+    // Only updating side — proceeding should be untouched.
+    const out = applyFiltersToSearch("?proceeding=upc.inf.cfi&side=defendant", { side: "claimant" });
+    expect(out).toContain("proceeding=upc.inf.cfi");
+    expect(out).toContain("side=claimant");
+  });
+});
+
+describe("URL round-trip — encode then parse yields the same value", () => {
+  test("proceeding", () => {
+    const enc = applyFiltersToSearch("", { proceeding: "upc.inf.cfi" });
+    expect(parseProceedingFromSearch(enc)).toBe("upc.inf.cfi");
+  });
+
+  test("side", () => {
+    const enc = applyFiltersToSearch("", { side: "defendant" });
+    expect(parseSideFromSearch(enc)).toBe("defendant");
+  });
+
+  test("target", () => {
+    const enc = applyFiltersToSearch("", { target: "kostenentscheidung" });
+    expect(parseAppealTargetFromSearch(enc)).toBe("kostenentscheidung");
+  });
+
+  test("trigger_date", () => {
+    const enc = applyFiltersToSearch("", { triggerDate: "2026-05-26" });
+    expect(parseTriggerDateFromSearch(enc)).toBe("2026-05-26");
+  });
+});
+
+describe("Scenario localStorage helpers", () => {
+  test("SCENARIO_PREFIX is paliad.verfahrensablauf.scenario and all keys live under it", () => {
+    expect(SCENARIO_PREFIX).toBe("paliad.verfahrensablauf.scenario");
+    for (const key of Object.values(SCENARIO_KEYS)) {
+      expect(key.startsWith(SCENARIO_PREFIX + ".")).toBe(true);
+    }
+  });
+
+  test("readEventChoices returns [] on empty storage", () => {
+    const s = makeMemoryStorage();
+    expect(readEventChoices(s)).toEqual([]);
+  });
+
+  test("writeEventChoices + readEventChoices round-trip", () => {
+    const s = makeMemoryStorage();
+    const choices = [
+      { submission_code: "upc.inf.cfi.r12", choice_kind: "appellant" as const, choice_value: "claimant" },
+      { submission_code: "upc.inf.cfi.r30", choice_kind: "include_ccr" as const, choice_value: "1" },
+    ];
+    writeEventChoices(s, choices);
+    expect(readEventChoices(s)).toEqual(choices);
+  });
+
+  test("writeEventChoices([]) clears the key (removeItem semantic, not empty string)", () => {
+    const s = makeMemoryStorage();
+    writeEventChoices(s, [{ submission_code: "r1", choice_kind: "skip", choice_value: "1" }]);
+    expect(s.getItem(SCENARIO_KEYS.eventChoices)).not.toBe(null);
+    writeEventChoices(s, []);
+    expect(s.getItem(SCENARIO_KEYS.eventChoices)).toBe(null);
+  });
+
+  test("readEventChoices ignores unknown choice_kind values", () => {
+    const s = makeMemoryStorage();
+    s.setItem(SCENARIO_KEYS.eventChoices, "r1:appellant=claimant,r2:bogus=x,r3:skip=1");
+    expect(readEventChoices(s)).toEqual([
+      { submission_code: "r1", choice_kind: "appellant", choice_value: "claimant" },
+      { submission_code: "r3", choice_kind: "skip", choice_value: "1" },
+    ]);
+  });
+
+  test("readCourtId returns '' on empty storage, echoes stored value otherwise", () => {
+    const s = makeMemoryStorage();
+    expect(readCourtId(s)).toBe("");
+    writeCourtId(s, "UPC-LD-MUC");
+    expect(readCourtId(s)).toBe("UPC-LD-MUC");
+  });
+
+  test("writeCourtId('') removes the key", () => {
+    const s = makeMemoryStorage();
+    writeCourtId(s, "UPC-LD-MUC");
+    expect(s.getItem(SCENARIO_KEYS.courtId)).toBe("UPC-LD-MUC");
+    writeCourtId(s, "");
+    expect(s.getItem(SCENARIO_KEYS.courtId)).toBe(null);
+  });
+
+  test("readBoolFlag / writeBoolFlag round-trip with removeItem on false", () => {
+    const s = makeMemoryStorage();
+    expect(readBoolFlag(s, SCENARIO_KEYS.ccr)).toBe(false);
+    writeBoolFlag(s, SCENARIO_KEYS.ccr, true);
+    expect(readBoolFlag(s, SCENARIO_KEYS.ccr)).toBe(true);
+    expect(s.getItem(SCENARIO_KEYS.ccr)).toBe("1");
+    writeBoolFlag(s, SCENARIO_KEYS.ccr, false);
+    expect(readBoolFlag(s, SCENARIO_KEYS.ccr)).toBe(false);
+    expect(s.getItem(SCENARIO_KEYS.ccr)).toBe(null);
+  });
+
+  test("readScenario returns all fields defaulted on empty storage", () => {
+    const s = makeMemoryStorage();
+    expect(readScenario(s)).toEqual({
+      eventChoices: [],
+      courtId: "",
+      ccr: false,
+      infAmend: false,
+      revAmend: false,
+      revCci: false,
+      showHidden: false,
+    });
+  });
+});
+
+describe("Hydration order — URL wins, localStorage fills the rest", () => {
+  test("URL fills filter chips, localStorage fills scenario state", () => {
+    const s = makeMemoryStorage();
+    writeCourtId(s, "UPC-LD-MUC");
+    writeBoolFlag(s, SCENARIO_KEYS.showHidden, true);
+    writeBoolFlag(s, SCENARIO_KEYS.ccr, true);
+    const out = hydrate(
+      "?proceeding=upc.inf.cfi&side=defendant&target=endentscheidung&trigger_date=2026-05-26",
+      s,
+    );
+    // URL-sourced
+    expect(out.proceeding).toBe("upc.inf.cfi");
+    expect(out.side).toBe("defendant");
+    expect(out.target).toBe("endentscheidung");
+    expect(out.triggerDate).toBe("2026-05-26");
+    // localStorage-sourced
+    expect(out.courtId).toBe("UPC-LD-MUC");
+    expect(out.showHidden).toBe(true);
+    expect(out.ccr).toBe(true);
+  });
+
+  test("absent URL → all filter fields are empty/null, localStorage still hydrates scenario", () => {
+    const s = makeMemoryStorage();
+    writeCourtId(s, "UPC-LD-MUC");
+    const out = hydrate("", s);
+    expect(out.proceeding).toBe("");
+    expect(out.side).toBe(null);
+    expect(out.target).toBe("");
+    expect(out.triggerDate).toBe("");
+    expect(out.courtId).toBe("UPC-LD-MUC");
+  });
+
+  test("absent localStorage → URL still fills filter chips, scenario defaults", () => {
+    const s = makeMemoryStorage();
+    const out = hydrate(
+      "?proceeding=upc.apl.unified&side=claimant&target=anordnung&trigger_date=2026-07-01",
+      s,
+    );
+    expect(out.proceeding).toBe("upc.apl.unified");
+    expect(out.side).toBe("claimant");
+    expect(out.target).toBe("anordnung");
+    expect(out.triggerDate).toBe("2026-07-01");
+    expect(out.courtId).toBe("");
+    expect(out.eventChoices).toEqual([]);
+    expect(out.showHidden).toBe(false);
+  });
+
+  test("a shared link doesn't leak the recipient's scenario state in", () => {
+    // Two storages: m's (loaded with court + flags) and a recipient's
+    // (empty). The same URL should reproduce filter chips identically
+    // but leave each user's scenario state untouched.
+    const mStorage = makeMemoryStorage();
+    writeCourtId(mStorage, "UPC-LD-MUC");
+    writeBoolFlag(mStorage, SCENARIO_KEYS.ccr, true);
+    const recipientStorage = makeMemoryStorage();
+
+    const sharedURL = "?proceeding=upc.inf.cfi&side=defendant&trigger_date=2026-05-26";
+
+    const mView = hydrate(sharedURL, mStorage);
+    const recipientView = hydrate(sharedURL, recipientStorage);
+
+    // Filter chips identical
+    expect(mView.proceeding).toBe(recipientView.proceeding);
+    expect(mView.side).toBe(recipientView.side);
+    expect(mView.triggerDate).toBe(recipientView.triggerDate);
+
+    // Scenario state diverges — recipient sees defaults
+    expect(mView.courtId).toBe("UPC-LD-MUC");
+    expect(recipientView.courtId).toBe("");
+    expect(mView.ccr).toBe(true);
+    expect(recipientView.ccr).toBe(false);
+  });
+});
+
+describe("URL key constants match the documented contract", () => {
+  test("URL_KEYS uses the spec'd snake_case names", () => {
+    expect(URL_KEYS.proceeding).toBe("proceeding");
+    expect(URL_KEYS.side).toBe("side");
+    expect(URL_KEYS.target).toBe("target");
+    expect(URL_KEYS.triggerDate).toBe("trigger_date");
+  });
+});

frontend/src/client/views/verfahrensablauf-state.ts

@@ -0,0 +1,263 @@
+// /tools/verfahrensablauf URL + scenario-localStorage state contract
+// (t-paliad-308 / m/paliad#137). Splits the page's persisted state into
+// two namespaces:
+//
+//   URL params (filter chips — the timeline kind the user is looking
+//   at; paste-able, shareable, refresh-resistant):
+//     proceeding, side, target, trigger_date
+//
+//   localStorage `paliad.verfahrensablauf.scenario.*` (per-user
+//   scenario inputs — the noisy parts that don't belong in a URL):
+//     event_choices, court_id, ccr, inf_amend, rev_amend, rev_cci,
+//     show_hidden
+//
+// Hydration order: URL wins. On page load, URL fills the filter chips;
+// localStorage fills the rest. Filter-chip changes write to URL only.
+// Scenario changes write to localStorage only. A shared link from a
+// colleague reproduces the timeline kind (proceeding + side + target +
+// trigger_date) but never leaks the recipient's court / flag /
+// event_choices state in.
+//
+// All helpers in this module are pure: they take a search string (or a
+// StorageLike) and return values, no DOM. The wiring in
+// ../verfahrensablauf.ts mounts them onto window.location +
+// window.localStorage at runtime.
+
+import type { EventChoice, ChoiceKind } from "./event-card-choices";
+
+// ----- URL params (filter chips) ----------------------------------
+
+export type Side = "claimant" | "defendant" | null;
+
+export const APPEAL_TARGETS = [
+  "endentscheidung",
+  "kostenentscheidung",
+  "anordnung",
+  "schadensbemessung",
+  "bucheinsicht",
+] as const;
+export type AppealTarget = (typeof APPEAL_TARGETS)[number] | "";
+
+export const URL_KEYS = {
+  proceeding: "proceeding",
+  side: "side",
+  target: "target",
+  triggerDate: "trigger_date",
+} as const;
+
+// parseProceedingFromSearch extracts the proceeding code. Returns ""
+// if absent. No validation against the proceeding registry — that's
+// the caller's job (an unknown code from a stale link should leave
+// the first-tile auto-select fallback running).
+export function parseProceedingFromSearch(search: string): string {
+  const v = new URLSearchParams(search).get(URL_KEYS.proceeding);
+  return v ?? "";
+}
+
+export function parseSideFromSearch(search: string): Side {
+  const raw = new URLSearchParams(search).get(URL_KEYS.side);
+  return raw === "claimant" || raw === "defendant" ? raw : null;
+}
+
+export function parseAppealTargetFromSearch(search: string): AppealTarget {
+  const raw = new URLSearchParams(search).get(URL_KEYS.target) || "";
+  if ((APPEAL_TARGETS as readonly string[]).includes(raw)) {
+    return raw as AppealTarget;
+  }
+  return "";
+}
+
+// parseTriggerDateFromSearch validates the ISO-date shape so a
+// malformed link can't poison the date input. Accepts "YYYY-MM-DD"
+// only. Round-tripped against Date to reject 2026-02-30 etc.
+export function parseTriggerDateFromSearch(search: string): string {
+  const raw = new URLSearchParams(search).get(URL_KEYS.triggerDate) || "";
+  if (!/^\d{4}-\d{2}-\d{2}$/.test(raw)) return "";
+  const d = new Date(raw + "T00:00:00Z");
+  if (Number.isNaN(d.getTime())) return "";
+  if (d.toISOString().slice(0, 10) !== raw) return "";
+  return raw;
+}
+
+// applyFiltersToSearch produces the canonical query string for the
+// four URL-owned params. Other params (e.g. ?view=, ?project=) are
+// preserved verbatim. Empty values are deleted, never written as
+// empty string, so the URL stays clean on the default.
+export function applyFiltersToSearch(
+  search: string,
+  filters: { proceeding?: string; side?: Side; target?: AppealTarget; triggerDate?: string },
+): string {
+  const params = new URLSearchParams(search);
+  if ("proceeding" in filters) {
+    if (filters.proceeding && filters.proceeding !== "") {
+      params.set(URL_KEYS.proceeding, filters.proceeding);
+    } else {
+      params.delete(URL_KEYS.proceeding);
+    }
+  }
+  if ("side" in filters) {
+    if (filters.side === "claimant" || filters.side === "defendant") {
+      params.set(URL_KEYS.side, filters.side);
+    } else {
+      params.delete(URL_KEYS.side);
+    }
+  }
+  if ("target" in filters) {
+    if (filters.target && filters.target !== "") {
+      params.set(URL_KEYS.target, filters.target);
+    } else {
+      params.delete(URL_KEYS.target);
+    }
+  }
+  if ("triggerDate" in filters) {
+    if (filters.triggerDate && /^\d{4}-\d{2}-\d{2}$/.test(filters.triggerDate)) {
+      params.set(URL_KEYS.triggerDate, filters.triggerDate);
+    } else {
+      params.delete(URL_KEYS.triggerDate);
+    }
+  }
+  const s = params.toString();
+  return s ? `?${s}` : "";
+}
+
+// ----- localStorage (scenario state) ------------------------------
+
+export const SCENARIO_PREFIX = "paliad.verfahrensablauf.scenario";
+export const SCENARIO_KEYS = {
+  eventChoices: `${SCENARIO_PREFIX}.event_choices`,
+  courtId: `${SCENARIO_PREFIX}.court_id`,
+  ccr: `${SCENARIO_PREFIX}.ccr`,
+  infAmend: `${SCENARIO_PREFIX}.inf_amend`,
+  revAmend: `${SCENARIO_PREFIX}.rev_amend`,
+  revCci: `${SCENARIO_PREFIX}.rev_cci`,
+  showHidden: `${SCENARIO_PREFIX}.show_hidden`,
+} as const;
+
+// StorageLike is the tiny subset of the Web Storage API the scenario
+// helpers actually use. Lets the tests pass a Map-backed fake without
+// pulling in a full localStorage polyfill.
+export interface StorageLike {
+  getItem(key: string): string | null;
+  setItem(key: string, value: string): void;
+  removeItem(key: string): void;
+}
+
+// readEventChoices is forgiving: malformed tuples or unknown
+// choice_kinds are dropped silently. Same shape as the legacy URL
+// codec (comma-separated `submission_code:kind=value`).
+export function readEventChoices(storage: StorageLike): EventChoice[] {
+  const raw = storage.getItem(SCENARIO_KEYS.eventChoices);
+  if (!raw) return [];
+  const out: EventChoice[] = [];
+  for (const tuple of raw.split(",")) {
+    const m = tuple.match(/^([^:]+):([^=]+)=(.+)$/);
+    if (!m) continue;
+    const kind = m[2] as ChoiceKind;
+    if (kind !== "appellant" && kind !== "include_ccr" && kind !== "skip") continue;
+    out.push({ submission_code: m[1], choice_kind: kind, choice_value: m[3] });
+  }
+  return out;
+}
+
+export function writeEventChoices(storage: StorageLike, choices: EventChoice[]): void {
+  if (choices.length === 0) {
+    storage.removeItem(SCENARIO_KEYS.eventChoices);
+    return;
+  }
+  const enc = choices
+    .map((c) => `${c.submission_code}:${c.choice_kind}=${c.choice_value}`)
+    .join(",");
+  storage.setItem(SCENARIO_KEYS.eventChoices, enc);
+}
+
+// readCourtId / writeCourtId — empty string == no court picked. The
+// "" value is stored as a removed key, not an empty string entry, so
+// reading it back yields null rather than "".
+export function readCourtId(storage: StorageLike): string {
+  return storage.getItem(SCENARIO_KEYS.courtId) ?? "";
+}
+
+export function writeCourtId(storage: StorageLike, courtId: string): void {
+  if (courtId === "") {
+    storage.removeItem(SCENARIO_KEYS.courtId);
+    return;
+  }
+  storage.setItem(SCENARIO_KEYS.courtId, courtId);
+}
+
+// Boolean flags — "1" / "0" string encoding, removeItem on default
+// (false for flags, also false for show_hidden) so the storage stays
+// uncluttered on a fresh page.
+export function readBoolFlag(storage: StorageLike, key: string): boolean {
+  return storage.getItem(key) === "1";
+}
+
+export function writeBoolFlag(storage: StorageLike, key: string, on: boolean): void {
+  if (on) storage.setItem(key, "1");
+  else storage.removeItem(key);
+}
+
+// Read all scenario state in one call — convenience for the page's
+// load-time hydration. Caller decides whether to apply each field
+// (e.g. court_id is proceeding-specific; the page may discard the
+// stored value if the active proceeding doesn't expose a court row).
+export interface ScenarioState {
+  eventChoices: EventChoice[];
+  courtId: string;
+  ccr: boolean;
+  infAmend: boolean;
+  revAmend: boolean;
+  revCci: boolean;
+  showHidden: boolean;
+}
+
+export function readScenario(storage: StorageLike): ScenarioState {
+  return {
+    eventChoices: readEventChoices(storage),
+    courtId: readCourtId(storage),
+    ccr: readBoolFlag(storage, SCENARIO_KEYS.ccr),
+    infAmend: readBoolFlag(storage, SCENARIO_KEYS.infAmend),
+    revAmend: readBoolFlag(storage, SCENARIO_KEYS.revAmend),
+    revCci: readBoolFlag(storage, SCENARIO_KEYS.revCci),
+    showHidden: readBoolFlag(storage, SCENARIO_KEYS.showHidden),
+  };
+}
+
+// ----- URL → localStorage hydration order -------------------------
+
+// The page's load-time contract: read URL filters, then read
+// scenario state from localStorage. URL wins on conflict — but the
+// only field that can conflict is none of them today (URL owns
+// proceeding/side/target/trigger_date; localStorage owns the rest).
+// The order matters for one edge case: if a future field migrates
+// from URL → localStorage with overlap, the URL value MUST be honored.
+
+export interface HydratedState extends ScenarioState {
+  proceeding: string;
+  side: Side;
+  target: AppealTarget;
+  triggerDate: string;
+}
+
+export function hydrate(search: string, storage: StorageLike): HydratedState {
+  const scenario = readScenario(storage);
+  return {
+    proceeding: parseProceedingFromSearch(search),
+    side: parseSideFromSearch(search),
+    target: parseAppealTargetFromSearch(search),
+    triggerDate: parseTriggerDateFromSearch(search),
+    ...scenario,
+  };
+}
+
+// makeMemoryStorage — tiny StorageLike for tests / SSR fallback.
+// Not used by the runtime page (which mounts real localStorage), but
+// kept here so test files have one well-known import.
+export function makeMemoryStorage(): StorageLike {
+  const store = new Map<string, string>();
+  return {
+    getItem: (k) => (store.has(k) ? store.get(k)! : null),
+    setItem: (k, v) => { store.set(k, v); },
+    removeItem: (k) => { store.delete(k); },
+  };
+}

frontend/src/components/Footer.tsx

@@ -5,7 +5,7 @@ export function Footer(): string {
     <footer className="footer">
       <div className="container">
         <p>
-          <span data-i18n="footer.text">{"© 2026 Paliad — ein Werkzeug von"}</span>{" "}
+          <span data-i18n="footer.text">{"© 2026 Paliad — by"}</span>{" "}
           <a href="https://flexsiebels.de" target="_blank" rel="noopener">flexsiebels.de</a>
         </p>
       </div>

frontend/src/i18n-keys.ts

@@ -125,6 +125,12 @@ export type I18nKey =
   | "admin.broadcasts.loading"
   | "admin.broadcasts.subtitle"
   | "admin.broadcasts.title"
+  | "admin.building_blocks.action.new"
+  | "admin.building_blocks.editor.empty"
+  | "admin.building_blocks.heading"
+  | "admin.building_blocks.loading"
+  | "admin.building_blocks.subtitle"
+  | "admin.building_blocks.title"
   | "admin.card.approval_policies.desc"
   | "admin.card.approval_policies.title"
   | "admin.card.audit.desc"
@@ -1190,10 +1196,6 @@ export type I18nKey =
   | "deadlines.appeal_target.kostenentscheidung"
   | "deadlines.appeal_target.label"
   | "deadlines.appeal_target.schadensbemessung"
-  | "deadlines.appellant.claimant"
-  | "deadlines.appellant.defendant"
-  | "deadlines.appellant.label"
-  | "deadlines.appellant.none"
   | "deadlines.calculate"
   | "deadlines.card.calc.add_to_project"
   | "deadlines.card.calc.add_to_project.disabled"
@@ -2619,6 +2621,8 @@ export type I18nKey =
   | "submissions.draft.action.export"
   | "submissions.draft.action.new"
   | "submissions.draft.back"
+  | "submissions.draft.base.hint"
+  | "submissions.draft.base.label"
   | "submissions.draft.import.button"
   | "submissions.draft.language"
   | "submissions.draft.language.de"
@@ -2631,6 +2635,8 @@ export type I18nKey =
   | "submissions.draft.parties.title"
   | "submissions.draft.preview.hint"
   | "submissions.draft.preview.title"
+  | "submissions.draft.sections.hint"
+  | "submissions.draft.sections.title"
   | "submissions.draft.switcher.label"
   | "submissions.draft.title"
   | "submissions.index.action.new"

frontend/src/styles/global.css

@@ -6124,6 +6124,414 @@ dialog.modal::backdrop {
 /* t-paliad-276 — DE/EN language toggle on the draft editor. Same look
    as the rest of the sidebar mini-controls; muted label + inline radios
    so it doesn't compete with the editor's primary inputs. */
+/* t-paliad-313 (m/paliad#141) Composer Slice A — base picker + section list. */
+.submission-draft-base-row {
+    display: flex;
+    flex-direction: column;
+    gap: 0.25rem;
+    margin: 0.5rem 0;
+}
+
+.submission-draft-base-row label {
+    color: var(--color-text-muted);
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    font-size: 0.85em;
+}
+
+.submission-draft-base-row select {
+    padding: 0.4rem 0.5rem;
+    border: 1px solid var(--color-border);
+    border-radius: 4px;
+    background: var(--color-bg-elev-1);
+    font-size: 0.95em;
+}
+
+.submission-draft-base-hint {
+    margin: 0;
+    font-size: 0.8em;
+    color: var(--color-text-muted);
+}
+
+.submission-draft-sections-wrap {
+    margin-top: 1rem;
+    padding: 1rem;
+    border: 1px dashed var(--color-border);
+    border-radius: 4px;
+    background: var(--color-bg-elev-1);
+}
+
+.submission-draft-sections-header {
+    display: flex;
+    align-items: baseline;
+    justify-content: space-between;
+    gap: 1rem;
+    margin-bottom: 0.75rem;
+}
+
+.submission-draft-sections-header h2 {
+    margin: 0;
+    font-size: 1.05em;
+}
+
+.submission-draft-sections-hint {
+    font-size: 0.8em;
+    color: var(--color-text-muted);
+}
+
+.submission-draft-sections-list {
+    list-style: decimal inside;
+    margin: 0;
+    padding: 0;
+    display: flex;
+    flex-direction: column;
+    gap: 0.6rem;
+}
+
+.submission-draft-section {
+    border: 1px solid var(--color-border);
+    border-radius: 4px;
+    padding: 0.6rem 0.8rem;
+    background: var(--color-bg-elev-2, var(--color-bg));
+}
+
+.submission-draft-section--excluded {
+    opacity: 0.55;
+    background: var(--color-bg-subtle, transparent);
+}
+
+.submission-draft-section-head {
+    display: flex;
+    align-items: baseline;
+    gap: 0.5rem;
+    flex-wrap: wrap;
+}
+
+.submission-draft-section-title {
+    display: inline;
+    margin: 0;
+    font-size: 0.95em;
+    font-weight: 600;
+}
+
+.submission-draft-section-kind {
+    font-size: 0.75em;
+    color: var(--color-text-muted);
+    background: var(--color-bg-subtle, transparent);
+    padding: 0.1rem 0.35rem;
+    border-radius: 3px;
+}
+
+.submission-draft-section-excluded-badge {
+    font-size: 0.75em;
+    color: var(--color-text-muted);
+    font-style: italic;
+}
+
+.submission-draft-section-body {
+    margin: 0.5rem 0 0 0;
+    padding: 0;
+    font-family: inherit;
+    font-size: 0.88em;
+    white-space: pre-wrap;
+    word-break: break-word;
+    color: var(--color-text);
+}
+
+/* t-paliad-313 Slice B — inline editor per section. */
+.submission-draft-section-toggle {
+    margin-left: auto;
+}
+
+.submission-draft-section-toolbar {
+    display: flex;
+    gap: 0.25rem;
+    margin: 0.4rem 0 0.3rem 0;
+}
+
+.submission-draft-section-toolbar-btn {
+    width: 1.8rem;
+    height: 1.8rem;
+    border: 1px solid var(--color-border);
+    border-radius: 3px;
+    background: var(--color-bg-elev-1);
+    font-weight: 600;
+    font-size: 0.85em;
+    cursor: pointer;
+    line-height: 1;
+}
+
+.submission-draft-section-toolbar-btn:hover {
+    background: var(--color-bg-subtle, var(--color-bg-elev-2));
+}
+
+.submission-draft-section-editor {
+    min-height: 3rem;
+    padding: 0.5rem 0.6rem;
+    border: 1px solid var(--color-border);
+    border-radius: 3px;
+    background: var(--color-bg-elev-1);
+    font-family: inherit;
+    font-size: 0.92em;
+    line-height: 1.5;
+    white-space: pre-wrap;
+    word-break: break-word;
+    outline: none;
+}
+
+.submission-draft-section-editor:focus {
+    border-color: var(--color-accent-fg, var(--color-text));
+    box-shadow: 0 0 0 2px var(--color-bg-lime-tint, transparent);
+}
+
+.submission-draft-section-editor:empty::before {
+    content: attr(data-placeholder);
+    color: var(--color-text-muted);
+    pointer-events: none;
+}
+
+.submission-draft-section--editing {
+    background: var(--color-bg-elev-2, var(--color-bg-elev-1));
+}
+
+/* t-paliad-315 Slice C — building-block picker modal */
+.submission-draft-section-bb-btn {
+    margin-left: auto;
+}
+
+.submission-bb-picker-overlay {
+    position: fixed;
+    inset: 0;
+    background: rgba(0,0,0,0.4);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    z-index: 1000;
+}
+
+.submission-bb-picker {
+    background: var(--color-bg, white);
+    border-radius: 6px;
+    padding: 1rem;
+    width: min(720px, 92vw);
+    max-height: 86vh;
+    display: flex;
+    flex-direction: column;
+    gap: 0.6rem;
+    box-shadow: 0 8px 32px rgba(0,0,0,0.25);
+}
+
+.submission-bb-picker-head {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+}
+
+.submission-bb-picker-head h2 {
+    margin: 0;
+    font-size: 1.1em;
+}
+
+.submission-bb-picker-search {
+    width: 100%;
+}
+
+.submission-bb-picker-sectioninfo {
+    margin: 0;
+    font-size: 0.85em;
+    color: var(--color-text-muted);
+}
+
+.submission-bb-picker-list {
+    overflow-y: auto;
+    display: flex;
+    flex-direction: column;
+    gap: 0.5rem;
+}
+
+.submission-bb-picker-row {
+    display: block;
+    width: 100%;
+    text-align: left;
+    padding: 0.6rem 0.8rem;
+    border: 1px solid var(--color-border);
+    border-radius: 4px;
+    background: var(--color-bg-elev-1);
+    cursor: pointer;
+}
+
+.submission-bb-picker-row:hover {
+    background: var(--color-bg-lime-tint, var(--color-bg-elev-2));
+}
+
+.submission-bb-picker-row-head {
+    display: flex;
+    align-items: baseline;
+    justify-content: space-between;
+    gap: 0.5rem;
+}
+
+.submission-bb-picker-row-desc {
+    margin: 0.25rem 0;
+    font-size: 0.85em;
+    color: var(--color-text-muted);
+}
+
+.submission-bb-picker-row-preview {
+    margin: 0.25rem 0 0 0;
+    padding: 0;
+    font-family: inherit;
+    font-size: 0.8em;
+    color: var(--color-text-muted);
+    white-space: pre-wrap;
+    max-height: 4em;
+    overflow: hidden;
+}
+
+.submission-bb-picker-vis {
+    font-size: 0.7em;
+    padding: 0.1rem 0.35rem;
+    border-radius: 3px;
+    background: var(--color-bg-subtle, transparent);
+    color: var(--color-text-muted);
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+}
+
+.submission-bb-picker-vis--private { background: #fde2e2; color: #8a2a2a; }
+.submission-bb-picker-vis--team    { background: #fff4d6; color: #7a5d12; }
+.submission-bb-picker-vis--firm    { background: #def5e2; color: #266e34; }
+.submission-bb-picker-vis--global  { background: #dce8fb; color: #1f437a; }
+
+.submission-bb-picker-empty {
+    text-align: center;
+    color: var(--color-text-muted);
+    padding: 1rem;
+}
+
+/* t-paliad-315 Slice C — /admin/submission-building-blocks editor */
+.admin-bb-layout {
+    display: grid;
+    grid-template-columns: minmax(220px, 280px) 1fr minmax(180px, 240px);
+    gap: 1rem;
+}
+
+.admin-bb-list {
+    display: flex;
+    flex-direction: column;
+    gap: 0.4rem;
+    max-height: 70vh;
+    overflow-y: auto;
+}
+
+.admin-bb-list-row {
+    display: flex;
+    flex-direction: column;
+    gap: 0.2rem;
+    padding: 0.5rem 0.7rem;
+    text-align: left;
+    border: 1px solid var(--color-border);
+    border-radius: 4px;
+    background: var(--color-bg-elev-1);
+    cursor: pointer;
+}
+
+.admin-bb-list-row--active {
+    background: var(--color-bg-lime-tint, var(--color-bg-elev-2));
+    border-color: var(--color-accent-fg, var(--color-text));
+}
+
+.admin-bb-list-title {
+    font-weight: 600;
+    font-size: 0.95em;
+}
+
+.admin-bb-list-meta {
+    display: flex;
+    gap: 0.3rem;
+    font-size: 0.7em;
+    color: var(--color-text-muted);
+}
+
+.admin-bb-list-section {
+    background: var(--color-bg-subtle, transparent);
+    padding: 0.05rem 0.35rem;
+    border-radius: 3px;
+}
+
+.admin-bb-list-vis {
+    padding: 0.05rem 0.35rem;
+    border-radius: 3px;
+}
+
+.admin-bb-list-vis--private { background: #fde2e2; color: #8a2a2a; }
+.admin-bb-list-vis--team    { background: #fff4d6; color: #7a5d12; }
+.admin-bb-list-vis--firm    { background: #def5e2; color: #266e34; }
+.admin-bb-list-vis--global  { background: #dce8fb; color: #1f437a; }
+
+.admin-bb-list-draft {
+    font-style: italic;
+    color: var(--color-text-muted);
+}
+
+.admin-bb-form {
+    display: flex;
+    flex-direction: column;
+    gap: 0.6rem;
+}
+
+.admin-bb-form-row {
+    display: flex;
+    flex-direction: column;
+    gap: 0.2rem;
+}
+
+.admin-bb-form-row--checkbox {
+    flex-direction: row;
+    align-items: center;
+    gap: 0.4rem;
+}
+
+.admin-bb-form-row > span {
+    font-size: 0.85em;
+    color: var(--color-text-muted);
+}
+
+.admin-bb-form-hint {
+    font-size: 0.75em;
+    color: var(--color-text-muted);
+}
+
+.admin-bb-form-actions {
+    display: flex;
+    gap: 0.5rem;
+    margin-top: 0.5rem;
+}
+
+.admin-bb-versions {
+    display: flex;
+    flex-direction: column;
+    gap: 0.4rem;
+    max-height: 70vh;
+    overflow-y: auto;
+}
+
+.admin-bb-version-row {
+    border: 1px solid var(--color-border);
+    border-radius: 4px;
+    padding: 0.4rem 0.55rem;
+    font-size: 0.78em;
+}
+
+.admin-bb-version-meta {
+    color: var(--color-text-muted);
+    margin-bottom: 0.25rem;
+}
+
+.admin-bb-empty {
+    color: var(--color-text-muted);
+}
+
 .submission-draft-language-row {
     display: flex;
     align-items: center;
@@ -6230,7 +6638,7 @@ dialog.modal::backdrop {
     align-items: baseline;
     padding: 0.75rem 1rem;
     border-bottom: 1px solid var(--color-border);
-    background: var(--color-surface-alt, #fafafa);
+    background: var(--color-surface-2);
     flex-wrap: wrap;
     gap: 0.5rem;
 }
@@ -6388,7 +6796,7 @@ dialog.modal::backdrop {
 }
 
 .submissions-new-chip:hover {
-    background: var(--color-surface-alt, #f4f4f4);
+    background: var(--color-surface-muted);
 }
 
 .submissions-new-chip--active {
@@ -6426,7 +6834,7 @@ dialog.modal::backdrop {
 }
 
 .submissions-new-project-item:hover {
-    background: var(--color-surface-alt, #f4f4f4);
+    background: var(--color-surface-muted);
 }
 
 .submissions-new-project-title {
@@ -6441,7 +6849,7 @@ dialog.modal::backdrop {
     flex-wrap: wrap;
     padding: 0.75rem 1rem;
     margin: 0 0 1.25rem;
-    background: var(--color-surface-alt, #f7f7f0);
+    background: var(--color-bg-subtle);
     border: 1px solid var(--color-border);
     border-left: 4px solid var(--color-accent, #c6f41c);
     border-radius: 6px;
@@ -6464,7 +6872,7 @@ dialog.modal::backdrop {
     flex-wrap: wrap;
     padding: 0.5rem 0.6rem;
     margin-bottom: 0.75rem;
-    background: var(--color-surface-alt, #f7f7f0);
+    background: var(--color-bg-subtle);
     border: 1px solid var(--color-border);
     border-radius: 6px;
 }
@@ -6592,7 +7000,7 @@ dialog.modal::backdrop {
     border: 1px solid var(--color-border);
     border-radius: 6px;
     padding: 0.6rem;
-    background: var(--color-surface-alt, #f7f7f0);
+    background: var(--color-bg-subtle);
     display: flex;
     flex-direction: column;
     gap: 0.5rem;
@@ -6715,7 +7123,7 @@ dialog.modal::backdrop {
     margin-left: 0.3rem;
     padding: 0 0.4em;
     border-radius: 3px;
-    background: var(--color-surface-alt, #f7f7f0);
+    background: var(--color-bg-subtle);
     color: var(--color-text-muted);
 }
 
@@ -7922,7 +8330,7 @@ dialog.modal::backdrop {
 .collab-invite-hint {
     margin-top: 0.5rem;
     padding: 0.5rem 0.75rem;
-    background: var(--color-surface-alt, var(--color-bg-lime-tint));
+    background: var(--color-bg-lime-tint);
     border: 1px dashed var(--color-border);
     border-radius: var(--radius);
     font-size: 0.85rem;
@@ -16582,7 +16990,7 @@ dialog.quick-add-sheet::backdrop {
     width: 1.4rem;
     height: 1.4rem;
     border-radius: 50%;
-    background: var(--color-surface-alt, #f4f4f4);
+    background: var(--color-surface-muted);
     color: var(--color-text-muted);
     font-size: 0.85rem;
     font-weight: 600;
@@ -16636,7 +17044,7 @@ dialog.quick-add-sheet::backdrop {
     font-size: 0.72rem;
     padding: 0.1rem 0.45rem;
     border-radius: 999px;
-    background: var(--color-surface-alt, #f4f4f4);
+    background: var(--color-surface-muted);
     color: var(--color-text-muted);
     font-weight: 500;
     letter-spacing: 0.02em;
@@ -16658,7 +17066,7 @@ dialog.quick-add-sheet::backdrop {
 }
 
 .smart-timeline-kind-chip--projected {
-    background: var(--color-surface-alt, #f4f4f4);
+    background: var(--color-surface-muted);
     color: var(--color-text-muted);
     font-style: italic;
 }
@@ -16725,7 +17133,7 @@ dialog.quick-add-sheet::backdrop {
 
 .smart-timeline-add-choice:hover:not(:disabled) {
     border-color: var(--color-accent-fg);
-    background: var(--color-surface-alt, #fafafa);
+    background: var(--color-surface-2);
 }
 
 .smart-timeline-add-choice--primary {

frontend/src/submission-draft.tsx

@@ -109,6 +109,27 @@ export function renderSubmissionDraft(): string {
                       </button>
                     </div>
 
+                    {/* t-paliad-313 (m/paliad#141) Composer Slice A —
+                        base picker. Hydrated by client/submission-draft.ts
+                        once /api/submission-bases returns. Disabled
+                        for pre-Composer drafts (base_id NULL); switching
+                        autosaves the draft. */}
+                    <div
+                      className="submission-draft-base-row"
+                      id="submission-draft-base-row"
+                      style="display:none">
+                      <label htmlFor="submission-draft-base" data-i18n="submissions.draft.base.label">
+                        Vorlagenbasis
+                      </label>
+                      <select id="submission-draft-base" />
+                      <p
+                        className="submission-draft-base-hint"
+                        id="submission-draft-base-hint"
+                        data-i18n="submissions.draft.base.hint">
+                        Steuert Schriftarten, Briefkopf und Abschnitts-Defaults.
+                      </p>
+                    </div>
+
                     {/* t-paliad-276 — output language toggle (DE/EN).
                         Hydrated by client/submission-draft.ts; switching
                         autosaves the draft and re-renders the preview. */}
@@ -202,6 +223,29 @@ export function renderSubmissionDraft(): string {
                     <div className="submission-draft-variables" id="submission-draft-variables" />
                   </aside>
 
+                  {/* t-paliad-313 (m/paliad#141) Composer Slice A —
+                      read-only section list. Painted from
+                      view.sections. Empty/hidden for pre-Composer
+                      drafts where no rows have been seeded. Slice B
+                      turns these into in-place editable prose blocks. */}
+                  <section
+                    className="submission-draft-sections-wrap"
+                    id="submission-draft-sections-wrap"
+                    style="display:none">
+                    <header className="submission-draft-sections-header">
+                      <h2 data-i18n="submissions.draft.sections.title">Abschnitte</h2>
+                      <span
+                        className="submission-draft-sections-hint"
+                        data-i18n="submissions.draft.sections.hint">
+                        Inhalt pro Abschnitt &mdash; Autosave nach 500 ms. Letztes Layout in Word.
+                      </span>
+                    </header>
+                    <ol
+                      className="submission-draft-sections-list"
+                      id="submission-draft-sections-list"
+                    />
+                  </section>
+
                   {/* Preview pane — read-only HTML render of the merged
                       document body. Re-renders on autosave round-trip. */}
                   <section className="submission-draft-preview-wrap">

frontend/src/verfahrensablauf.tsx

@@ -250,23 +250,6 @@ export function renderVerfahrensablauf(): string {
                         </label>
                       </div>
                     </div>
-                    <div className="verfahrensablauf-perspective-row" id="appellant-row" style="display:none">
-                      <span className="date-label" data-i18n="deadlines.appellant.label">Berufung durch:</span>
-                      <div className="fristen-view-toggle" role="radiogroup" aria-label="Appellant">
-                        <label className="fristen-view-option">
-                          <input type="radio" name="appellant" value="claimant" />
-                          <span data-i18n="deadlines.appellant.claimant">Klägerseite</span>
-                        </label>
-                        <label className="fristen-view-option">
-                          <input type="radio" name="appellant" value="defendant" />
-                          <span data-i18n="deadlines.appellant.defendant">Beklagtenseite</span>
-                        </label>
-                        <label className="fristen-view-option">
-                          <input type="radio" name="appellant" value="" checked />
-                          <span data-i18n="deadlines.appellant.none">—</span>
-                        </label>
-                      </div>
-                    </div>
                     {/* Show-hidden toggle (t-paliad-290 / m/paliad#122).
                          Re-surfaces optional cards the user has previously
                          marked "Überspringen" via the per-card popover.

internal/db/migrations/137_proceeding_role_labels.down.sql

@@ -0,0 +1,18 @@
+-- 137_proceeding_role_labels — DOWN
+--
+-- Drops the 4 role-label columns. Backfilled data is lost on
+-- down-migration; that's acceptable because the frontend renderer
+-- falls back to the default labels ("Klägerseite" / "Beklagtenseite")
+-- when the columns are absent.
+
+ALTER TABLE paliad.proceeding_types
+    DROP COLUMN IF EXISTS role_reactive_label_en;
+
+ALTER TABLE paliad.proceeding_types
+    DROP COLUMN IF EXISTS role_reactive_label_de;
+
+ALTER TABLE paliad.proceeding_types
+    DROP COLUMN IF EXISTS role_proactive_label_en;
+
+ALTER TABLE paliad.proceeding_types
+    DROP COLUMN IF EXISTS role_proactive_label_de;

internal/db/migrations/137_proceeding_role_labels.up.sql

@@ -0,0 +1,137 @@
+-- 137_proceeding_role_labels — t-paliad-301, m/paliad#132
+--
+-- Bug A fix: per-proceeding role labels so the Verfahrensablauf side
+-- selector can render "Berufungskläger / Berufungsbeklagter" for the
+-- unified UPC Berufung tile instead of the generic "Klägerseite /
+-- Beklagtenseite".
+--
+-- Four new optional columns on paliad.proceeding_types. NULL on a
+-- column falls back to the language-default ("Klägerseite" / "Claimant
+-- side" / "Beklagtenseite" / "Defendant side") in the frontend renderer.
+-- Only the proceedings whose role-naming actually differs get a backfill.
+--
+-- Live-DB audit (mcp__supabase__execute_sql) before drafting:
+--   - paliad.proceeding_types has 14 columns; the 4 target columns do
+--     NOT exist (zero name collisions).
+--   - Zero triggers on paliad.proceeding_types. No audit_reason
+--     setup needed.
+--   - No updated_at / created_at on the table — DO NOT include
+--     timestamp UPDATEs (lesson from mig 134 HOTFIX 3).
+--
+-- ADDITIVE ONLY. ALTER + UPDATE statements; no CHECK constraints
+-- (the columns are free-text labels, validated at the application layer).
+-- Down migration drops the 4 columns.
+--
+-- See m/paliad#132 for the full design rationale + the role-label
+-- matrix per proceeding code.
+
+-- ---------------------------------------------------------------
+-- 1. Schema additions
+-- ---------------------------------------------------------------
+
+ALTER TABLE paliad.proceeding_types
+    ADD COLUMN role_proactive_label_de text NULL;
+
+ALTER TABLE paliad.proceeding_types
+    ADD COLUMN role_proactive_label_en text NULL;
+
+ALTER TABLE paliad.proceeding_types
+    ADD COLUMN role_reactive_label_de text NULL;
+
+ALTER TABLE paliad.proceeding_types
+    ADD COLUMN role_reactive_label_en text NULL;
+
+COMMENT ON COLUMN paliad.proceeding_types.role_proactive_label_de IS
+    'DE label for the proactive (claimant-equivalent) side of this '
+    'proceeding. NULL = renderer falls back to "Klägerseite". '
+    't-paliad-301 / m/paliad#132 Bug A.';
+COMMENT ON COLUMN paliad.proceeding_types.role_proactive_label_en IS
+    'EN label for the proactive side. NULL = "Claimant side".';
+COMMENT ON COLUMN paliad.proceeding_types.role_reactive_label_de IS
+    'DE label for the reactive (defendant-equivalent) side. NULL = '
+    '"Beklagtenseite".';
+COMMENT ON COLUMN paliad.proceeding_types.role_reactive_label_en IS
+    'EN label for the reactive side. NULL = "Defendant side".';
+
+-- ---------------------------------------------------------------
+-- 2. Audit-first NOTICE pass.
+--
+-- Lists which proceeding_types are about to receive a backfill so
+-- the operator sees the scope before the UPDATE fires. NULL columns
+-- on every other row stay NULL (the frontend falls back to defaults).
+-- ---------------------------------------------------------------
+
+DO $$
+DECLARE
+    rec record;
+    backfill_count int := 0;
+BEGIN
+    RAISE NOTICE '[mig 137] Proceedings that will receive role-label backfill:';
+    FOR rec IN
+        SELECT code, name
+          FROM paliad.proceeding_types
+         WHERE code IN ('upc.apl.unified', 'upc.rev.cfi', 'epa.opp.opd', 'epa.opp.boa')
+         ORDER BY code
+    LOOP
+        RAISE NOTICE '[mig 137]   %  %', rec.code, rec.name;
+        backfill_count := backfill_count + 1;
+    END LOOP;
+    RAISE NOTICE '[mig 137] Total: % proceedings (others stay NULL → renderer default)', backfill_count;
+END $$;
+
+-- ---------------------------------------------------------------
+-- 3. Backfill.
+--
+-- Per the design matrix in m/paliad#132:
+--   - upc.apl.unified → Berufungskläger / Berufungsbeklagter / Appellant / Appellee
+--   - upc.rev.cfi     → Antragsteller (Nichtigkeit) / Antragsgegner (Nichtigkeit) /
+--                       Revocation claimant / Revocation defendant
+--   - epa.opp.opd     → Einsprechende(r) / Patentinhaber(in) /
+--                       Opponent / Patentee
+--   - epa.opp.boa     → Einsprechende(r) / Patentinhaber(in) /
+--                       Opponent / Patentee
+--   - (others)        → stay NULL → frontend defaults
+-- ---------------------------------------------------------------
+
+UPDATE paliad.proceeding_types
+   SET role_proactive_label_de = 'Berufungskläger',
+       role_reactive_label_de  = 'Berufungsbeklagter',
+       role_proactive_label_en = 'Appellant',
+       role_reactive_label_en  = 'Appellee'
+ WHERE code = 'upc.apl.unified';
+
+UPDATE paliad.proceeding_types
+   SET role_proactive_label_de = 'Antragsteller (Nichtigkeit)',
+       role_reactive_label_de  = 'Antragsgegner (Nichtigkeit)',
+       role_proactive_label_en = 'Revocation claimant',
+       role_reactive_label_en  = 'Revocation defendant'
+ WHERE code = 'upc.rev.cfi';
+
+UPDATE paliad.proceeding_types
+   SET role_proactive_label_de = 'Einsprechende(r)',
+       role_reactive_label_de  = 'Patentinhaber(in)',
+       role_proactive_label_en = 'Opponent',
+       role_reactive_label_en  = 'Patentee'
+ WHERE code IN ('epa.opp.opd', 'epa.opp.boa');
+
+-- ---------------------------------------------------------------
+-- 4. Post-migration NOTICE — informational only.
+-- ---------------------------------------------------------------
+
+DO $$
+DECLARE
+    rec record;
+BEGIN
+    RAISE NOTICE '[mig 137] post: backfilled role-label distribution:';
+    FOR rec IN
+        SELECT code,
+               role_proactive_label_de,
+               role_reactive_label_de
+          FROM paliad.proceeding_types
+         WHERE role_proactive_label_de IS NOT NULL
+         ORDER BY code
+    LOOP
+        RAISE NOTICE '[mig 137]   %  proactive=%  reactive=%',
+            rec.code, rec.role_proactive_label_de, rec.role_reactive_label_de;
+    END LOOP;
+END $$;

internal/db/migrations/138_appeal_target_backfill_merits_order.down.sql

@@ -0,0 +1,71 @@
+-- 138_appeal_target_backfill_merits_order DOWN — t-paliad-303, m/paliad#134
+--
+-- Removes 'schadensbemessung' from the merits-track rules and
+-- 'bucheinsicht' from the order-track rules, restoring the pre-137
+-- shape (endentscheidung-only / anordnung-only / kostenentscheidung-only).
+
+-- ---------------------------------------------------------------
+-- 0. Audit reason (required by mig 079 trigger for any UPDATE on
+--    paliad.deadline_rules).
+-- ---------------------------------------------------------------
+
+SELECT set_config(
+    'paliad.audit_reason',
+    'mig 138 DOWN: t-paliad-303 — strip Schadensbemessung/Bucheinsicht from applies_to_target per m/paliad#134',
+    true);
+
+-- ---------------------------------------------------------------
+-- 1. Strip new targets via array_remove.
+--
+-- WHERE clauses pinned to upc.apl.unified to avoid touching unrelated
+-- rules that might have been added later under other proceeding types.
+-- ---------------------------------------------------------------
+
+-- 1a. Remove schadensbemessung from merits-track rows.
+UPDATE paliad.deadline_rules dr
+   SET applies_to_target = array_remove(dr.applies_to_target, 'schadensbemessung')
+  FROM paliad.proceeding_types pt
+ WHERE pt.id = dr.proceeding_type_id
+   AND pt.code = 'upc.apl.unified'
+   AND dr.is_active = true
+   AND 'schadensbemessung' = ANY(dr.applies_to_target);
+
+-- 1b. Remove bucheinsicht from order-track rows.
+UPDATE paliad.deadline_rules dr
+   SET applies_to_target = array_remove(dr.applies_to_target, 'bucheinsicht')
+  FROM paliad.proceeding_types pt
+ WHERE pt.id = dr.proceeding_type_id
+   AND pt.code = 'upc.apl.unified'
+   AND dr.is_active = true
+   AND 'bucheinsicht' = ANY(dr.applies_to_target);
+
+-- ---------------------------------------------------------------
+-- 2. Sanity check — no row may carry the new targets after the down.
+-- ---------------------------------------------------------------
+
+DO $$
+DECLARE
+    schad_left int;
+    buch_left int;
+BEGIN
+    SELECT COUNT(*) INTO schad_left
+      FROM paliad.deadline_rules dr
+      JOIN paliad.proceeding_types pt ON pt.id = dr.proceeding_type_id
+     WHERE pt.code = 'upc.apl.unified'
+       AND dr.is_active = true
+       AND 'schadensbemessung' = ANY(dr.applies_to_target);
+    SELECT COUNT(*) INTO buch_left
+      FROM paliad.deadline_rules dr
+      JOIN paliad.proceeding_types pt ON pt.id = dr.proceeding_type_id
+     WHERE pt.code = 'upc.apl.unified'
+       AND dr.is_active = true
+       AND 'bucheinsicht' = ANY(dr.applies_to_target);
+
+    IF schad_left > 0 THEN
+        RAISE EXCEPTION '[mig 138 DOWN] FAILED — % rows still carry schadensbemessung', schad_left;
+    END IF;
+    IF buch_left > 0 THEN
+        RAISE EXCEPTION '[mig 138 DOWN] FAILED — % rows still carry bucheinsicht', buch_left;
+    END IF;
+    RAISE NOTICE '[mig 138 DOWN] stripped schadensbemessung + bucheinsicht from upc.apl.unified rules';
+END $$;

internal/db/migrations/138_appeal_target_backfill_merits_order.up.sql

@@ -0,0 +1,232 @@
+-- 138_appeal_target_backfill_merits_order — t-paliad-303, m/paliad#134
+--
+-- Slice B1 (mig 134) introduced the unified upc.apl.unified proceeding type
+-- with 5 appeal_target enum values: endentscheidung, kostenentscheidung,
+-- anordnung, schadensbemessung, bucheinsicht. The first three each carry
+-- rules; schadensbemessung and bucheinsicht returned an empty timeline
+-- because no rules referenced them yet.
+--
+-- m's 2026-05-26 decision (#134): extend applies_to_target on the existing
+-- rules — Schadensbemessung := merits track (R.224 anchored on R.118
+-- substantive decisions), Bucheinsicht := order track (R.220.2 +
+-- R.224.2.b + R.235.2 + R.237 + R.238.2 etc.). Legal premise verified
+-- against the 16 live rules — every endentscheidung rule is a generic
+-- R.224 merits step, every anordnung rule is a generic R.220/224/235/237/
+-- 238 order step. No rule carries content specific to a particular kind
+-- of underlying decision/order. Audit on the comment trail of #134.
+
+-- ---------------------------------------------------------------
+-- 0. Audit reason (required by mig 079 trigger for any UPDATE on
+--    paliad.deadline_rules — both UPDATEs below trigger it).
+-- ---------------------------------------------------------------
+
+SELECT set_config(
+    'paliad.audit_reason',
+    'mig 138: t-paliad-303 — extend applies_to_target for Schadensbemessung (merits) + Bucheinsicht (order) per m/paliad#134',
+    true);
+
+-- ---------------------------------------------------------------
+-- 1. Audit-first DO block.
+--
+-- Resolve upc.apl.unified, count the rows we are about to touch, and
+-- RAISE EXCEPTION if anything looks wrong (proceeding type missing,
+-- merits/order rule counts off, or a rule already carries the new
+-- target — which would mean an earlier partial run).
+-- ---------------------------------------------------------------
+
+DO $$
+DECLARE
+    rec record;
+    upc_apl_id int;
+    merits_count int;
+    order_count int;
+    schad_already int;
+    buch_already int;
+BEGIN
+    SELECT id INTO upc_apl_id
+      FROM paliad.proceeding_types
+     WHERE code = 'upc.apl.unified';
+    IF upc_apl_id IS NULL THEN
+        RAISE EXCEPTION '[mig 138] upc.apl.unified proceeding_type not found — mig 134 must run first';
+    END IF;
+    RAISE NOTICE '[mig 138] upc.apl.unified proceeding_type_id = %', upc_apl_id;
+
+    SELECT COUNT(*) INTO merits_count
+      FROM paliad.deadline_rules
+     WHERE proceeding_type_id = upc_apl_id
+       AND is_active = true
+       AND 'endentscheidung' = ANY(applies_to_target);
+    SELECT COUNT(*) INTO order_count
+      FROM paliad.deadline_rules
+     WHERE proceeding_type_id = upc_apl_id
+       AND is_active = true
+       AND 'anordnung' = ANY(applies_to_target);
+
+    RAISE NOTICE '[mig 138] live counts: endentscheidung=% anordnung=%', merits_count, order_count;
+    IF merits_count <> 7 THEN
+        RAISE EXCEPTION '[mig 138] expected 7 endentscheidung rules under upc.apl.unified, got %', merits_count;
+    END IF;
+    IF order_count <> 7 THEN
+        RAISE EXCEPTION '[mig 138] expected 7 anordnung rules under upc.apl.unified, got %', order_count;
+    END IF;
+
+    SELECT COUNT(*) INTO schad_already
+      FROM paliad.deadline_rules
+     WHERE proceeding_type_id = upc_apl_id
+       AND is_active = true
+       AND 'schadensbemessung' = ANY(applies_to_target);
+    SELECT COUNT(*) INTO buch_already
+      FROM paliad.deadline_rules
+     WHERE proceeding_type_id = upc_apl_id
+       AND is_active = true
+       AND 'bucheinsicht' = ANY(applies_to_target);
+    IF schad_already > 0 THEN
+        RAISE EXCEPTION '[mig 138] % rules already carry schadensbemessung — partial run?', schad_already;
+    END IF;
+    IF buch_already > 0 THEN
+        RAISE EXCEPTION '[mig 138] % rules already carry bucheinsicht — partial run?', buch_already;
+    END IF;
+
+    RAISE NOTICE '[mig 138] rules to extend with schadensbemessung (merits track):';
+    FOR rec IN
+        SELECT dr.id, dr.rule_code, dr.legal_source, dr.name, dr.applies_to_target
+          FROM paliad.deadline_rules dr
+         WHERE dr.proceeding_type_id = upc_apl_id
+           AND dr.is_active = true
+           AND 'endentscheidung' = ANY(dr.applies_to_target)
+         ORDER BY dr.sequence_order, dr.rule_code NULLS LAST
+    LOOP
+        RAISE NOTICE '[mig 138]   merits  %  %  %  pre=%  →  post=%',
+            COALESCE(rec.rule_code, '(no-code)'),
+            COALESCE(rec.legal_source, '(no-source)'),
+            rec.name,
+            rec.applies_to_target,
+            rec.applies_to_target || 'schadensbemessung'::text;
+    END LOOP;
+
+    RAISE NOTICE '[mig 138] rules to extend with bucheinsicht (order track):';
+    FOR rec IN
+        SELECT dr.id, dr.rule_code, dr.legal_source, dr.name, dr.applies_to_target
+          FROM paliad.deadline_rules dr
+         WHERE dr.proceeding_type_id = upc_apl_id
+           AND dr.is_active = true
+           AND 'anordnung' = ANY(dr.applies_to_target)
+         ORDER BY dr.sequence_order, dr.rule_code NULLS LAST
+    LOOP
+        RAISE NOTICE '[mig 138]   order   %  %  %  pre=%  →  post=%',
+            COALESCE(rec.rule_code, '(no-code)'),
+            COALESCE(rec.legal_source, '(no-source)'),
+            rec.name,
+            rec.applies_to_target,
+            rec.applies_to_target || 'bucheinsicht'::text;
+    END LOOP;
+END $$;
+
+-- ---------------------------------------------------------------
+-- 2. Extend applies_to_target.
+--
+-- Narrow WHERE clauses key off upc.apl.unified + existing target +
+-- absence of new target, so the UPDATEs are idempotent in spirit
+-- (the audit block above already RAISE EXCEPTIONed if any row
+-- already had the new value).
+-- ---------------------------------------------------------------
+
+-- 2a. Schadensbemessung := merits track (7 rules expected).
+UPDATE paliad.deadline_rules dr
+   SET applies_to_target = applies_to_target || 'schadensbemessung'::text
+  FROM paliad.proceeding_types pt
+ WHERE pt.id = dr.proceeding_type_id
+   AND pt.code = 'upc.apl.unified'
+   AND dr.is_active = true
+   AND 'endentscheidung' = ANY(dr.applies_to_target)
+   AND NOT ('schadensbemessung' = ANY(dr.applies_to_target));
+
+-- 2b. Bucheinsicht := order track (7 rules expected).
+UPDATE paliad.deadline_rules dr
+   SET applies_to_target = applies_to_target || 'bucheinsicht'::text
+  FROM paliad.proceeding_types pt
+ WHERE pt.id = dr.proceeding_type_id
+   AND pt.code = 'upc.apl.unified'
+   AND dr.is_active = true
+   AND 'anordnung' = ANY(dr.applies_to_target)
+   AND NOT ('bucheinsicht' = ANY(dr.applies_to_target));
+
+-- ---------------------------------------------------------------
+-- 3. Post-migration sanity check.
+--
+-- Hard-fail on any divergence: the two new targets must each cover
+-- 7 rules, the original three targets must be unchanged in count,
+-- and no rule has lost its prior target.
+-- ---------------------------------------------------------------
+
+DO $$
+DECLARE
+    schad_post int;
+    buch_post int;
+    end_post int;
+    anord_post int;
+    cost_post int;
+    target_distribution record;
+BEGIN
+    SELECT COUNT(*) INTO schad_post
+      FROM paliad.deadline_rules dr
+      JOIN paliad.proceeding_types pt ON pt.id = dr.proceeding_type_id
+     WHERE pt.code = 'upc.apl.unified'
+       AND dr.is_active = true
+       AND 'schadensbemessung' = ANY(dr.applies_to_target);
+    SELECT COUNT(*) INTO buch_post
+      FROM paliad.deadline_rules dr
+      JOIN paliad.proceeding_types pt ON pt.id = dr.proceeding_type_id
+     WHERE pt.code = 'upc.apl.unified'
+       AND dr.is_active = true
+       AND 'bucheinsicht' = ANY(dr.applies_to_target);
+    SELECT COUNT(*) INTO end_post
+      FROM paliad.deadline_rules dr
+      JOIN paliad.proceeding_types pt ON pt.id = dr.proceeding_type_id
+     WHERE pt.code = 'upc.apl.unified'
+       AND dr.is_active = true
+       AND 'endentscheidung' = ANY(dr.applies_to_target);
+    SELECT COUNT(*) INTO anord_post
+      FROM paliad.deadline_rules dr
+      JOIN paliad.proceeding_types pt ON pt.id = dr.proceeding_type_id
+     WHERE pt.code = 'upc.apl.unified'
+       AND dr.is_active = true
+       AND 'anordnung' = ANY(dr.applies_to_target);
+    SELECT COUNT(*) INTO cost_post
+      FROM paliad.deadline_rules dr
+      JOIN paliad.proceeding_types pt ON pt.id = dr.proceeding_type_id
+     WHERE pt.code = 'upc.apl.unified'
+       AND dr.is_active = true
+       AND 'kostenentscheidung' = ANY(dr.applies_to_target);
+
+    RAISE NOTICE '[mig 138] post: schadensbemessung=%  bucheinsicht=%  endentscheidung=%  anordnung=%  kostenentscheidung=%',
+        schad_post, buch_post, end_post, anord_post, cost_post;
+
+    IF schad_post <> 7 THEN
+        RAISE EXCEPTION '[mig 138] FAILED — expected 7 schadensbemessung rules, got %', schad_post;
+    END IF;
+    IF buch_post <> 7 THEN
+        RAISE EXCEPTION '[mig 138] FAILED — expected 7 bucheinsicht rules, got %', buch_post;
+    END IF;
+    IF end_post <> 7 THEN
+        RAISE EXCEPTION '[mig 138] FAILED — endentscheidung count drifted: expected 7, got %', end_post;
+    END IF;
+    IF anord_post <> 7 THEN
+        RAISE EXCEPTION '[mig 138] FAILED — anordnung count drifted: expected 7, got %', anord_post;
+    END IF;
+    IF cost_post <> 2 THEN
+        RAISE EXCEPTION '[mig 138] FAILED — kostenentscheidung count drifted: expected 2, got %', cost_post;
+    END IF;
+
+    FOR target_distribution IN
+        SELECT unnest(applies_to_target) AS target, COUNT(*) AS n
+          FROM paliad.deadline_rules dr
+          JOIN paliad.proceeding_types pt ON pt.id = dr.proceeding_type_id
+         WHERE pt.code = 'upc.apl.unified' AND dr.is_active = true
+         GROUP BY unnest(applies_to_target)
+         ORDER BY 1
+    LOOP
+        RAISE NOTICE '[mig 138] post: applies_to_target=%  count=%',
+            target_distribution.target, target_distribution.n;
+    END LOOP;
+END $$;

internal/db/migrations/139_deadline_rules_unified_view.down.sql

@@ -0,0 +1,7 @@
+-- 139_deadline_rules_unified_view (down) — Slice B.3, t-paliad-305
+--
+-- Drops the view. The underlying paliad.sequencing_rules /
+-- procedural_events / legal_sources tables are untouched (they own the
+-- data — the view is just a projection).
+
+DROP VIEW IF EXISTS paliad.deadline_rules_unified;

internal/db/migrations/139_deadline_rules_unified_view.up.sql

@@ -0,0 +1,122 @@
+-- 139_deadline_rules_unified_view — Slice B.3 read cutover (t-paliad-305 / m/paliad#93)
+--
+-- Creates paliad.deadline_rules_unified — a Postgres VIEW that
+-- re-projects paliad.sequencing_rules + paliad.procedural_events +
+-- paliad.legal_sources back into the legacy paliad.deadline_rules
+-- column shape.
+--
+-- Why a view instead of rewriting every SELECT in Go:
+--
+--   - 19 read sites across 11 service files reference
+--     paliad.deadline_rules. Rewriting each by hand multiplies the
+--     opportunity for off-by-one bugs in the JOIN.
+--   - The view has the same column names + types as the legacy table,
+--     so the change in Go is a 1-token substitution per query
+--     (FROM paliad.deadline_rules → FROM paliad.deadline_rules_unified)
+--     with no struct or scanner changes.
+--   - When B.4 drops paliad.deadline_rules, this view stays — it
+--     becomes the canonical legacy-shape reader for any code that
+--     hasn't been migrated to direct sr/pe/ls reads.
+--
+-- Column mapping (per design §4.2):
+--   - id, proceeding_type_id, parent_id, primary_party, duration_*,
+--     timing, sequence_order, is_spawn/court_set/bilateral, priority,
+--     rule_code, rule_codes, deadline_notes(_en), condition_expr,
+--     choices_offered, applies_to_target, trigger_event_id,
+--     spawn_proceeding_type_id, anchor_alt, alt_duration_*,
+--     alt_rule_code, combine_op, lifecycle_state, draft_of,
+--     published_at, is_active, created_at, updated_at, spawn_label
+--       → from paliad.sequencing_rules
+--   - submission_code           → procedural_events.code
+--   - name, name_en, description→ procedural_events
+--   - event_type                → procedural_events.event_kind (renamed)
+--   - concept_id                → procedural_events
+--   - legal_source              → legal_sources.citation (via legal_source_id FK)
+--
+-- The view is READ-ONLY by default. Writes still go to the underlying
+-- tables — RuleEditorService is refactored in the same slice to write
+-- directly to sr/pe/ls. paliad.deadline_rules is FROZEN from B.3 onward
+-- (no new writes); the dual-write helper from B.2 is decommissioned.
+
+-- The CHECK constraint on sequencing_rules.primary_party doesn't exist
+-- yet (mig 135 only constrained deadline_rules.primary_party). The view
+-- inherits whatever value sr.primary_party carries; mig 136's backfill
+-- set sr.primary_party = dr.primary_party so the canonical four-value
+-- vocab is already in place. A later slice can add the same CHECK to
+-- sequencing_rules itself.
+
+CREATE OR REPLACE VIEW paliad.deadline_rules_unified AS
+SELECT
+    sr.id,
+    sr.proceeding_type_id,
+    sr.parent_id,
+    pe.code                    AS submission_code,
+    pe.name,
+    pe.name_en,
+    pe.description,
+    sr.primary_party,
+    pe.event_kind              AS event_type,
+    sr.duration_value,
+    sr.duration_unit,
+    sr.timing,
+    sr.alt_duration_value,
+    sr.alt_duration_unit,
+    sr.alt_rule_code,
+    sr.anchor_alt,
+    sr.combine_op,
+    sr.rule_code,
+    sr.deadline_notes,
+    sr.deadline_notes_en,
+    sr.sequence_order,
+    sr.is_spawn,
+    sr.spawn_label,
+    sr.spawn_proceeding_type_id,
+    sr.is_bilateral,
+    sr.is_court_set,
+    sr.priority,
+    sr.condition_expr,
+    pe.concept_id,
+    ls.citation                AS legal_source,
+    sr.trigger_event_id,
+    sr.rule_codes,
+    sr.choices_offered,
+    sr.applies_to_target,
+    sr.lifecycle_state,
+    sr.draft_of,
+    sr.published_at,
+    sr.is_active,
+    sr.created_at,
+    sr.updated_at
+  FROM paliad.sequencing_rules sr
+  JOIN paliad.procedural_events pe ON pe.id = sr.procedural_event_id
+  LEFT JOIN paliad.legal_sources  ls ON ls.id = pe.legal_source_id;
+
+COMMENT ON VIEW paliad.deadline_rules_unified IS
+    'Slice B.3 (mig 139, t-paliad-305): legacy-shape projection over '
+    'sequencing_rules + procedural_events + legal_sources. Read-only — '
+    'writes go directly to the three underlying tables via '
+    'RuleEditorService. Survives B.4 destructive drop of '
+    'paliad.deadline_rules; the view will then be the only '
+    'legacy-shape reader.';
+
+-- Post-apply integrity check: confirm the view's row count matches the
+-- live sequencing_rules row count. A mismatch would indicate either a
+-- mid-deploy race (rare) or a JOIN issue (the LEFT JOIN to legal_sources
+-- never drops rows, the INNER JOIN to procedural_events drops sr rows
+-- whose procedural_event_id is NULL — but that column is NOT NULL on
+-- the table so it can't happen). Belt-and-braces.
+DO $$
+DECLARE
+    v_view_count int;
+    v_sr_count   int;
+BEGIN
+    SELECT COUNT(*) INTO v_view_count FROM paliad.deadline_rules_unified;
+    SELECT COUNT(*) INTO v_sr_count   FROM paliad.sequencing_rules;
+    IF v_view_count <> v_sr_count THEN
+        RAISE EXCEPTION '[mig 139] FAILED POST: view row count % does not match sequencing_rules row count %. '
+            'Possible cause: a sequencing_rules row references a procedural_event_id that does not exist (NOT NULL FK should prevent this).',
+            v_view_count, v_sr_count;
+    END IF;
+    RAISE NOTICE '[mig 139] view OK — deadline_rules_unified rows = % (= sequencing_rules)',
+        v_view_count;
+END $$;

internal/db/migrations/145_scenarios.down.sql

@@ -0,0 +1,13 @@
+-- 145_scenarios — DOWN
+--
+-- Reverses mig 145. Drops the FK on paliad.projects, the table, the
+-- trigger function, and the RLS policies (CASCADE on table drop kills
+-- policies). Any data in paliad.scenarios is lost on down.
+
+ALTER TABLE paliad.projects
+    DROP COLUMN IF EXISTS active_scenario_id;
+
+DROP TRIGGER IF EXISTS scenarios_touch_updated_at_trg ON paliad.scenarios;
+DROP FUNCTION IF EXISTS paliad.scenarios_touch_updated_at();
+
+DROP TABLE IF EXISTS paliad.scenarios CASCADE;

internal/db/migrations/145_scenarios.up.sql

@@ -0,0 +1,170 @@
+-- 145_scenarios — Slice D, m/paliad#124 §5 (revised)
+--
+-- Creates paliad.scenarios + paliad.projects.active_scenario_id FK.
+-- A scenario is a named composition of existing proceedings + flags
+-- + per-card choices + anchor dates the user can switch between for
+-- a project (project_id NOT NULL) OR save as an abstract template on
+-- /tools/verfahrensablauf (project_id IS NULL).
+--
+-- m's 2026-05-26 picks (AskUserQuestion round, doc commit 6e58595):
+--   Q1: composition shape  → primary+spawned (v1); multi-proceeding
+--                            peer compose is the v2 goal. spec.jsonb
+--                            architected for N entries from day 1.
+--   Q2: scope              → per-project + abstract.
+--   Q3: trigger dates      → per-anchor overrides over one base date.
+--   Q4: storage            → NEW paliad.scenarios table with jsonb
+--                            spec (NOT a project_event_choices column
+--                            extension).
+--
+-- "users should not add their own rules" (m, t-paliad-301) — scenarios
+-- compose existing rules, never author new ones. spec.proceedings[*].code
+-- must resolve to an existing active paliad.proceeding_types row;
+-- spec.proceedings[*].anchor_overrides keys must resolve to existing
+-- submission_codes. Validation happens at the application layer
+-- (ScenarioService.validateSpec) — not in DB CHECK constraints (too
+-- expensive to express in pure SQL).
+--
+-- Migration number: 145. Coordination check 2026-05-26 17:38: curie's
+-- B.2-B.6 migrations land in the 139-143 range. 144 reserved as buffer.
+-- 145 is the next safe claim.
+--
+-- ADDITIVE ONLY: CREATE TABLE, ALTER ADD COLUMN, indexes, RLS policies.
+-- Down drops everything. No backfill (zero existing scenarios on day 1).
+--
+-- See docs/design-litigation-planner-2026-05-26.md §5 + §18.4 for the
+-- design.
+
+-- ---------------------------------------------------------------
+-- 1. The scenarios table
+-- ---------------------------------------------------------------
+
+CREATE TABLE paliad.scenarios (
+    id          uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    -- project_id NULL = abstract scenario (saved Verfahrensablauf
+    -- template, no Akte). project_id NOT NULL = scenario attached to
+    -- a real Akte.
+    project_id  uuid NULL REFERENCES paliad.projects(id) ON DELETE CASCADE,
+    name        text NOT NULL,
+    description text NULL,
+    -- spec carries the full composition. Shape documented in the
+    -- design doc §5; the application validates structure before write.
+    spec        jsonb NOT NULL,
+    created_by  uuid NULL REFERENCES paliad.users(id) ON DELETE SET NULL,
+    created_at  timestamptz NOT NULL DEFAULT now(),
+    updated_at  timestamptz NOT NULL DEFAULT now(),
+
+    -- Within a single project, scenario names are unique. Abstract
+    -- scenarios are unique per (created_by, name) so two users can
+    -- each keep a "with_ccr" template without colliding. NULLS NOT
+    -- DISTINCT means a single user can have one "name" per
+    -- (project_id, created_by) tuple, where NULL project_id +
+    -- NULL created_by is a single global namespace (used only by
+    -- seed / system scenarios — none today).
+    CONSTRAINT scenarios_unique_per_scope
+        UNIQUE NULLS NOT DISTINCT (project_id, created_by, name),
+
+    -- Non-empty name.
+    CONSTRAINT scenarios_name_nonempty CHECK (char_length(name) > 0),
+
+    -- Non-empty spec — at least an object. The application checks
+    -- structure (version, proceedings[], base_trigger_date format).
+    CONSTRAINT scenarios_spec_object CHECK (jsonb_typeof(spec) = 'object')
+);
+
+CREATE INDEX scenarios_project_id_idx
+    ON paliad.scenarios(project_id) WHERE project_id IS NOT NULL;
+
+CREATE INDEX scenarios_abstract_user_idx
+    ON paliad.scenarios(created_by) WHERE project_id IS NULL;
+
+COMMENT ON TABLE paliad.scenarios IS
+    'Named compositions of existing proceedings + flags + per-card '
+    'choices + anchor dates. project_id NULL = abstract template; '
+    'project_id NOT NULL = attached to an Akte. Design: '
+    'docs/design-litigation-planner-2026-05-26.md §5. (Slice D)';
+
+COMMENT ON COLUMN paliad.scenarios.spec IS
+    'jsonb composition spec. Shape: {version: int, base_trigger_date: '
+    'ISO date, proceedings: [{code, role, flags[], per_card_choices, '
+    'anchor_overrides, skip_rules[]}, ...]}. Validated at write-time '
+    'by ScenarioService.validateSpec.';
+
+-- ---------------------------------------------------------------
+-- 2. paliad.projects.active_scenario_id FK
+--
+-- NULL = use today's ad-hoc per-card choice state from
+-- paliad.project_event_choices (pre-scenario behaviour preserved).
+-- Non-NULL = the project's current SmartTimeline / Akte-Fristenrechner
+-- render reads from this scenario's spec instead.
+-- ---------------------------------------------------------------
+
+ALTER TABLE paliad.projects
+    ADD COLUMN active_scenario_id uuid NULL
+        REFERENCES paliad.scenarios(id) ON DELETE SET NULL;
+
+COMMENT ON COLUMN paliad.projects.active_scenario_id IS
+    'FK to paliad.scenarios. NULL = read choices from '
+    'paliad.project_event_choices (legacy). Non-NULL = read from the '
+    'pointed scenario.spec.';
+
+-- ---------------------------------------------------------------
+-- 3. RLS — mirror paliad.project_event_choices's pattern (mig 129).
+--
+-- Project-scoped scenarios (project_id NOT NULL) inherit team visibility
+-- via paliad.can_see_project. Abstract scenarios (project_id IS NULL)
+-- are private to created_by — only the author can read / write them.
+-- ---------------------------------------------------------------
+
+ALTER TABLE paliad.scenarios ENABLE ROW LEVEL SECURITY;
+
+-- Project-scoped: team visibility.
+DROP POLICY IF EXISTS scenarios_project_select ON paliad.scenarios;
+CREATE POLICY scenarios_project_select ON paliad.scenarios
+    FOR SELECT
+    USING (project_id IS NOT NULL AND paliad.can_see_project(project_id));
+
+DROP POLICY IF EXISTS scenarios_project_mutate ON paliad.scenarios;
+CREATE POLICY scenarios_project_mutate ON paliad.scenarios
+    FOR ALL
+    USING (project_id IS NOT NULL AND paliad.can_see_project(project_id))
+    WITH CHECK (project_id IS NOT NULL AND paliad.can_see_project(project_id));
+
+-- Abstract: owner-only.
+DROP POLICY IF EXISTS scenarios_abstract_select ON paliad.scenarios;
+CREATE POLICY scenarios_abstract_select ON paliad.scenarios
+    FOR SELECT
+    USING (project_id IS NULL AND created_by = auth.uid());
+
+DROP POLICY IF EXISTS scenarios_abstract_mutate ON paliad.scenarios;
+CREATE POLICY scenarios_abstract_mutate ON paliad.scenarios
+    FOR ALL
+    USING (project_id IS NULL AND created_by = auth.uid())
+    WITH CHECK (project_id IS NULL AND created_by = auth.uid());
+
+-- ---------------------------------------------------------------
+-- 4. updated_at trigger (mirrors other paliad tables that carry
+-- updated_at — keep it in lockstep with row mutations).
+-- ---------------------------------------------------------------
+
+CREATE OR REPLACE FUNCTION paliad.scenarios_touch_updated_at()
+    RETURNS trigger AS $$
+BEGIN
+    NEW.updated_at = now();
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER scenarios_touch_updated_at_trg
+    BEFORE UPDATE ON paliad.scenarios
+    FOR EACH ROW
+    EXECUTE FUNCTION paliad.scenarios_touch_updated_at();
+
+-- ---------------------------------------------------------------
+-- 5. Informational NOTICE — schema-only migration, zero rows added.
+-- ---------------------------------------------------------------
+
+DO $$
+BEGIN
+    RAISE NOTICE '[mig 145] paliad.scenarios created (0 rows; awaits API usage)';
+    RAISE NOTICE '[mig 145] paliad.projects.active_scenario_id added (all rows NULL initially)';
+END $$;

internal/db/migrations/146_submission_bases.down.sql

@@ -0,0 +1,3 @@
+-- t-paliad-313: revert submission_bases catalog.
+
+DROP TABLE IF EXISTS paliad.submission_bases;

internal/db/migrations/146_submission_bases.up.sql

@@ -0,0 +1,173 @@
+-- t-paliad-313 (m/paliad#141): Composer Slice A — submission base catalog.
+--
+-- paliad.submission_bases is a thin pointer table — each row maps a
+-- short, stable slug ("hlc-letterhead", "neutral", …) onto a Gitea path
+-- that holds the actual .docx body, plus a JSON section-spec describing
+-- the base's default section set, stylemap, and per-section seed
+-- Markdown. The .docx in Gitea stays the source of truth for the
+-- chrome, fonts, paragraph styles, and (in later slices) the
+-- {{#section:KEY}} anchors. The DB row carries the listable metadata
+-- the picker needs.
+--
+-- Visibility: every authenticated user SELECTs (the catalog is shared
+-- firm-wide). Mutations are admin-only and enforced in Go at the
+-- handler layer — RLS only gates reads.
+--
+-- Slice A seeds two rows:
+--   1. hlc-letterhead — points at the existing HLC firm skeleton
+--      (_firm-skeleton.docx with HL Patents Style typography).
+--   2. neutral — points at the universal _skeleton.docx.
+-- Specialist bases (lg-duesseldorf, upc-formal) land in Slice E with
+-- their own .docx authoring task.
+
+CREATE TABLE IF NOT EXISTS paliad.submission_bases (
+    id                uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    slug              text NOT NULL UNIQUE,
+    firm              text,
+    proceeding_family text,
+    label_de          text NOT NULL,
+    label_en          text NOT NULL,
+    description_de    text,
+    description_en    text,
+    gitea_path        text NOT NULL,
+    section_spec      jsonb NOT NULL,
+    is_default_for    text[] NOT NULL DEFAULT '{}'::text[],
+    is_active         bool NOT NULL DEFAULT true,
+    created_at        timestamptz NOT NULL DEFAULT now(),
+    updated_at        timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS submission_bases_firm_family_idx
+    ON paliad.submission_bases (firm, proceeding_family) WHERE is_active;
+
+ALTER TABLE paliad.submission_bases ENABLE ROW LEVEL SECURITY;
+
+DROP POLICY IF EXISTS submission_bases_select ON paliad.submission_bases;
+CREATE POLICY submission_bases_select
+    ON paliad.submission_bases FOR SELECT TO authenticated
+    USING (true);
+
+-- INSERT / UPDATE / DELETE intentionally absent — admin-only mutations
+-- happen via the handler layer with explicit role checks. No RLS path
+-- for mutations means RLS denies them by default.
+
+DROP TRIGGER IF EXISTS submission_bases_set_updated_at ON paliad.submission_bases;
+CREATE TRIGGER submission_bases_set_updated_at
+    BEFORE UPDATE ON paliad.submission_bases
+    FOR EACH ROW EXECUTE FUNCTION paliad.tg_set_updated_at();
+
+COMMENT ON TABLE paliad.submission_bases IS
+    't-paliad-313: Composer base catalog. One row per base template (HLC letterhead, neutral, …) pointing at a .docx in Gitea + a JSON section spec.';
+
+-- Seed: HLC letterhead + neutral skeleton. The section_spec carries the
+-- 10 default sections (letterhead, caption, introduction, requests,
+-- facts, legal_argument, evidence, exhibits, closing, signature) with
+-- their kinds, default order, and bilingual labels. seed_md_de /
+-- seed_md_en are populated for the bag-driven sections (letterhead,
+-- caption, signature); the remaining sections seed empty.
+--
+-- exhibits.included=false by default (lawyer opts in when an attachment
+-- list applies). Every other section ships included=true.
+
+INSERT INTO paliad.submission_bases
+    (slug, firm, proceeding_family, label_de, label_en, description_de, description_en, gitea_path, section_spec, is_default_for)
+VALUES
+    ('hlc-letterhead', 'HLC', NULL,
+     'HLC-Briefkopf', 'HLC letterhead',
+     'Mit HL Patents Style — Firmen-Header, Schriftarten, Absatzformaten.',
+     'With HL Patents Style — firm header, fonts, paragraph styles.',
+     '6 - material/Templates/Word/Paliad/HLC/_firm-skeleton.docx',
+     jsonb_build_object(
+         'version', 1,
+         'stylemap', jsonb_build_object(
+             'paragraph',      'HLpat-Body-B0',
+             'heading_1',      'HLpat-Heading-H1',
+             'heading_2',      'HLpat-Heading-H2',
+             'heading_3',      'HLpat-Heading-H3',
+             'list_bullet',    'HLpat-Body-B0',
+             'list_numbered',  'HLpat-Body-B0',
+             'blockquote',     'HLpat-Body-B1'
+         ),
+         'defaults', jsonb_build_array(
+             jsonb_build_object('section_key','letterhead',     'kind','prose',    'order_index', 1, 'label_de','Briefkopf',             'label_en','Letterhead',
+                                'included',true,
+                                'seed_md_de', E'Schriftsatz von {{firm.name}}\n\n{{user.display_name}}, {{user.office}}',
+                                'seed_md_en', E'Submission by {{firm.name}}\n\n{{user.display_name}}, {{user.office}}'),
+             jsonb_build_object('section_key','caption',        'kind','prose',    'order_index', 2, 'label_de','Rubrum',                'label_en','Caption',
+                                'included',true,
+                                'seed_md_de', E'In der Sache\n\n**{{parties.claimant.0.name}}**\nvertreten durch {{parties.claimant.0.representative}}\n\n— Klägerin —\n\ngegen\n\n**{{parties.defendant.0.name}}**\nvertreten durch {{parties.defendant.0.representative}}\n\n— Beklagte —\n\nAktenzeichen: {{project.case_number}}\n{{project.court}}',
+                                'seed_md_en', E'In the matter\n\n**{{parties.claimant.0.name}}**\nrepresented by {{parties.claimant.0.representative}}\n\n— Claimant —\n\nv.\n\n**{{parties.defendant.0.name}}**\nrepresented by {{parties.defendant.0.representative}}\n\n— Defendant —\n\nCase number: {{project.case_number}}\n{{project.court}}'),
+             jsonb_build_object('section_key','introduction',   'kind','prose',    'order_index', 3, 'label_de','Einleitung',            'label_en','Introduction',
+                                'included',true, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','requests',       'kind','requests', 'order_index', 4, 'label_de','Anträge',               'label_en','Requests',
+                                'included',true, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','facts',          'kind','prose',    'order_index', 5, 'label_de','Sachverhalt',           'label_en','Facts',
+                                'included',true, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','legal_argument', 'kind','prose',    'order_index', 6, 'label_de','Rechtliche Würdigung',  'label_en','Legal argument',
+                                'included',true, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','evidence',       'kind','evidence', 'order_index', 7, 'label_de','Beweisangebote',        'label_en','Evidence offering',
+                                'included',true, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','exhibits',       'kind','prose',    'order_index', 8, 'label_de','Anlagen',               'label_en','Exhibits',
+                                'included',false, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','closing',        'kind','prose',    'order_index', 9, 'label_de','Schlussformel',         'label_en','Closing',
+                                'included',true,
+                                'seed_md_de', E'Mit freundlichen Grüßen',
+                                'seed_md_en', E'Yours sincerely,'),
+             jsonb_build_object('section_key','signature',      'kind','prose',    'order_index',10, 'label_de','Unterschrift',          'label_en','Signature',
+                                'included',true,
+                                'seed_md_de', E'{{user.display_name}}\n{{user.office}}',
+                                'seed_md_en', E'{{user.display_name}}\n{{user.office}}')
+         )
+     ),
+     '{}'::text[]
+    ),
+    ('neutral', NULL, NULL,
+     'Neutraler Schriftsatz', 'Neutral skeleton',
+     'Universelle Vorlage ohne firmenspezifisches Branding.',
+     'Universal template with no firm-specific branding.',
+     '6 - material/Templates/Word/Paliad/HLC/_skeleton.docx',
+     jsonb_build_object(
+         'version', 1,
+         'stylemap', jsonb_build_object(
+             'paragraph',      'Normal',
+             'heading_1',      'Heading 1',
+             'heading_2',      'Heading 2',
+             'heading_3',      'Heading 3',
+             'list_bullet',    'Normal',
+             'list_numbered',  'Normal',
+             'blockquote',     'Quote'
+         ),
+         'defaults', jsonb_build_array(
+             jsonb_build_object('section_key','letterhead',     'kind','prose',    'order_index', 1, 'label_de','Briefkopf',             'label_en','Letterhead',
+                                'included',true,
+                                'seed_md_de', E'Schriftsatz von {{firm.name}}\n\n{{user.display_name}}',
+                                'seed_md_en', E'Submission by {{firm.name}}\n\n{{user.display_name}}'),
+             jsonb_build_object('section_key','caption',        'kind','prose',    'order_index', 2, 'label_de','Rubrum',                'label_en','Caption',
+                                'included',true,
+                                'seed_md_de', E'In der Sache\n\n**{{parties.claimant.0.name}}**\n— Klägerin —\n\ngegen\n\n**{{parties.defendant.0.name}}**\n— Beklagte —\n\nAktenzeichen: {{project.case_number}}',
+                                'seed_md_en', E'In the matter\n\n**{{parties.claimant.0.name}}**\n— Claimant —\n\nv.\n\n**{{parties.defendant.0.name}}**\n— Defendant —\n\nCase number: {{project.case_number}}'),
+             jsonb_build_object('section_key','introduction',   'kind','prose',    'order_index', 3, 'label_de','Einleitung',            'label_en','Introduction',
+                                'included',true, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','requests',       'kind','requests', 'order_index', 4, 'label_de','Anträge',               'label_en','Requests',
+                                'included',true, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','facts',          'kind','prose',    'order_index', 5, 'label_de','Sachverhalt',           'label_en','Facts',
+                                'included',true, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','legal_argument', 'kind','prose',    'order_index', 6, 'label_de','Rechtliche Würdigung',  'label_en','Legal argument',
+                                'included',true, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','evidence',       'kind','evidence', 'order_index', 7, 'label_de','Beweisangebote',        'label_en','Evidence offering',
+                                'included',true, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','exhibits',       'kind','prose',    'order_index', 8, 'label_de','Anlagen',               'label_en','Exhibits',
+                                'included',false, 'seed_md_de', '', 'seed_md_en', ''),
+             jsonb_build_object('section_key','closing',        'kind','prose',    'order_index', 9, 'label_de','Schlussformel',         'label_en','Closing',
+                                'included',true,
+                                'seed_md_de', E'Mit freundlichen Grüßen',
+                                'seed_md_en', E'Yours sincerely,'),
+             jsonb_build_object('section_key','signature',      'kind','prose',    'order_index',10, 'label_de','Unterschrift',          'label_en','Signature',
+                                'included',true,
+                                'seed_md_de', E'{{user.display_name}}',
+                                'seed_md_en', E'{{user.display_name}}')
+         )
+     ),
+     '{}'::text[]
+    )
+ON CONFLICT (slug) DO NOTHING;

internal/db/migrations/147_submission_drafts_composer.down.sql

@@ -0,0 +1,5 @@
+-- t-paliad-313: revert Composer columns on submission_drafts.
+
+ALTER TABLE paliad.submission_drafts
+    DROP COLUMN IF EXISTS composer_meta,
+    DROP COLUMN IF EXISTS base_id;

internal/db/migrations/147_submission_drafts_composer.up.sql

@@ -0,0 +1,31 @@
+-- t-paliad-313 (m/paliad#141): Composer Slice A — point submission_drafts at a base.
+--
+-- Two purely-additive columns on paliad.submission_drafts:
+--
+--   base_id uuid — FK to paliad.submission_bases. NULL on existing
+--     drafts (Slice A explicitly does NOT auto-upgrade pre-Composer
+--     rows — that's Slice C). NEW drafts created post-Composer get
+--     base_id seeded by SubmissionDraftService.Create from the firm
+--     default for the proceeding family. ON DELETE SET NULL keeps a
+--     draft renderable via the v1 fallback chain even if its base is
+--     removed; the lawyer picks a new base via the sidebar.
+--
+--   composer_meta jsonb — Composer-specific metadata. For Slice A this
+--     carries the seed-time section order so the editor paints without
+--     a join. Future slices may add hidden_sections, active_locale,
+--     etc.
+--
+-- No data backfill, no auto-upgrade — pre-Composer drafts keep base_id
+-- NULL and render via the existing v1 path. The Go side has the
+-- corresponding gate (base_id IS NULL OR no submission_sections rows →
+-- v1 path).
+
+ALTER TABLE paliad.submission_drafts
+    ADD COLUMN IF NOT EXISTS base_id       uuid REFERENCES paliad.submission_bases(id) ON DELETE SET NULL,
+    ADD COLUMN IF NOT EXISTS composer_meta jsonb NOT NULL DEFAULT '{}'::jsonb;
+
+COMMENT ON COLUMN paliad.submission_drafts.base_id IS
+    't-paliad-313: Composer base reference. NULL = pre-Composer draft, renders via v1 fallback chain. ON DELETE SET NULL.';
+
+COMMENT ON COLUMN paliad.submission_drafts.composer_meta IS
+    't-paliad-313: Composer-side metadata (section_order, hidden_sections, …). jsonb, default {}.';

internal/db/migrations/148_submission_sections.down.sql

@@ -0,0 +1,3 @@
+-- t-paliad-313: revert submission_sections table.
+
+DROP TABLE IF EXISTS paliad.submission_sections;

internal/db/migrations/148_submission_sections.up.sql

@@ -0,0 +1,116 @@
+-- t-paliad-313 (m/paliad#141): Composer Slice A — per-draft section rows.
+--
+-- paliad.submission_sections holds one row per (draft, section_key) for
+-- Composer-mode drafts. Slice A seeds rows on draft create from the
+-- base's section_spec.defaults; the editor renders them read-only. Slice
+-- B turns them editable, Slice F adds reorder/hide/add-custom.
+--
+-- kind values per the design (Q10 ratification — no *_auto kind):
+--   'prose'    — free Markdown content (default).
+--   'requests' — Anträge-style content (editor may add auto-numbering
+--                later; Slice A treats identical to 'prose').
+--   'evidence' — Beweisangebote (editor may prefix lines with
+--                'Beweis: '; Slice A treats identical to 'prose').
+--
+-- Visibility flows through draft_id → submission_drafts → can_see_project
+-- + owner-scoped. RLS policies mirror the four-policy shape on
+-- submission_drafts so seeding from the Go service stays inside the
+-- same RLS envelope.
+--
+-- content_md_de + content_md_en both NOT NULL DEFAULT '' so neither
+-- side blocks the bilingual-by-construction render path. Empty content
+-- renders as the missing-content marker per the editor's contract.
+--
+-- Per the brief (head's instruction msg #2392) Slice A does NOT auto-
+-- upgrade the 11 pre-Composer drafts — those remain base_id=NULL with
+-- no section rows. The v1 fallback render path stays compiled in to
+-- keep them working.
+
+CREATE TABLE IF NOT EXISTS paliad.submission_sections (
+    id            uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    draft_id      uuid NOT NULL REFERENCES paliad.submission_drafts(id) ON DELETE CASCADE,
+    section_key   text NOT NULL,
+    order_index   int  NOT NULL,
+    kind          text NOT NULL,
+    label_de      text NOT NULL,
+    label_en      text NOT NULL,
+    included      bool NOT NULL DEFAULT true,
+    content_md_de text NOT NULL DEFAULT '',
+    content_md_en text NOT NULL DEFAULT '',
+    created_at    timestamptz NOT NULL DEFAULT now(),
+    updated_at    timestamptz NOT NULL DEFAULT now(),
+
+    CONSTRAINT submission_sections_kind_check
+        CHECK (kind IN ('prose', 'requests', 'evidence')),
+    CONSTRAINT submission_sections_unique_per_draft
+        UNIQUE (draft_id, section_key)
+);
+
+CREATE INDEX IF NOT EXISTS submission_sections_draft_idx
+    ON paliad.submission_sections (draft_id, order_index);
+
+ALTER TABLE paliad.submission_sections ENABLE ROW LEVEL SECURITY;
+
+DROP POLICY IF EXISTS submission_sections_select ON paliad.submission_sections;
+CREATE POLICY submission_sections_select
+    ON paliad.submission_sections FOR SELECT TO authenticated
+    USING (
+        EXISTS (
+            SELECT 1 FROM paliad.submission_drafts d
+             WHERE d.id = paliad.submission_sections.draft_id
+               AND d.user_id = auth.uid()
+               AND (d.project_id IS NULL OR paliad.can_see_project(d.project_id))
+        )
+    );
+
+DROP POLICY IF EXISTS submission_sections_insert ON paliad.submission_sections;
+CREATE POLICY submission_sections_insert
+    ON paliad.submission_sections FOR INSERT TO authenticated
+    WITH CHECK (
+        EXISTS (
+            SELECT 1 FROM paliad.submission_drafts d
+             WHERE d.id = paliad.submission_sections.draft_id
+               AND d.user_id = auth.uid()
+               AND (d.project_id IS NULL OR paliad.can_see_project(d.project_id))
+        )
+    );
+
+DROP POLICY IF EXISTS submission_sections_update ON paliad.submission_sections;
+CREATE POLICY submission_sections_update
+    ON paliad.submission_sections FOR UPDATE TO authenticated
+    USING (
+        EXISTS (
+            SELECT 1 FROM paliad.submission_drafts d
+             WHERE d.id = paliad.submission_sections.draft_id
+               AND d.user_id = auth.uid()
+               AND (d.project_id IS NULL OR paliad.can_see_project(d.project_id))
+        )
+    )
+    WITH CHECK (
+        EXISTS (
+            SELECT 1 FROM paliad.submission_drafts d
+             WHERE d.id = paliad.submission_sections.draft_id
+               AND d.user_id = auth.uid()
+               AND (d.project_id IS NULL OR paliad.can_see_project(d.project_id))
+        )
+    );
+
+DROP POLICY IF EXISTS submission_sections_delete ON paliad.submission_sections;
+CREATE POLICY submission_sections_delete
+    ON paliad.submission_sections FOR DELETE TO authenticated
+    USING (
+        EXISTS (
+            SELECT 1 FROM paliad.submission_drafts d
+             WHERE d.id = paliad.submission_sections.draft_id
+               AND d.user_id = auth.uid()
+               AND (d.project_id IS NULL OR paliad.can_see_project(d.project_id))
+        )
+    );
+
+DROP TRIGGER IF EXISTS submission_sections_set_updated_at ON paliad.submission_sections;
+CREATE TRIGGER submission_sections_set_updated_at
+    BEFORE UPDATE ON paliad.submission_sections
+    FOR EACH ROW EXECUTE FUNCTION paliad.tg_set_updated_at();
+
+COMMENT ON TABLE paliad.submission_sections IS
+    't-paliad-313: per-draft Composer section rows. Slice A: seeded on draft create from base.section_spec.defaults, rendered read-only. Slice B: editable. RLS mirrors submission_drafts (owner-scoped + can_see_project).';

internal/db/migrations/149_submission_building_blocks.down.sql

@@ -0,0 +1,4 @@
+-- t-paliad-315: revert building blocks library.
+
+DROP TABLE IF EXISTS paliad.submission_building_block_admin_versions;
+DROP TABLE IF EXISTS paliad.submission_building_blocks;

internal/db/migrations/149_submission_building_blocks.up.sql

@@ -0,0 +1,118 @@
+-- t-paliad-315 (m/paliad#141): Composer Slice C — building blocks library.
+--
+-- Per the design at docs/design-submission-generator-v2-2026-05-26.md §4.4
+-- and the Q2 / Q9 ratifications:
+--
+--   Q2 (m, 2026-05-26): building blocks are plain text paste sources.
+--     No building_block_id reference is stored on submission_sections —
+--     insertion is a one-way copy of content_md_<lang> into the section.
+--     This table records the library; submission_sections doesn't know
+--     where its content came from.
+--
+--   Q9 (m, 2026-05-26): four visibility tiers — private / team / firm
+--     / global. Picker filtering and RLS SELECT predicate both honour
+--     the tier. Tier upgrades (private → team/firm/global) go through
+--     admin moderation in later slices; Slice C starts with admin-only
+--     mutations (no user-initiated rows yet).
+--
+-- The _admin_versions companion table mirrors the email-templates
+-- retention=20 audit history. It is INTERNAL to the admin editor —
+-- not referenced from submission_sections, not exposed to the lawyer.
+-- It exists so accidental delete + accidental overwrite are
+-- recoverable.
+
+CREATE TABLE IF NOT EXISTS paliad.submission_building_blocks (
+    id                uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    slug              text NOT NULL,
+    firm              text,                       -- e.g. 'HLC', NULL = cross-firm
+    section_key       text NOT NULL,              -- which section kind this block fits
+    proceeding_family text,                       -- 'de.inf.lg', NULL = any family
+    title_de          text NOT NULL,
+    title_en          text NOT NULL,
+    description_de    text,
+    description_en    text,
+    content_md_de     text NOT NULL DEFAULT '',
+    content_md_en     text NOT NULL DEFAULT '',
+    author_id         uuid REFERENCES paliad.users(id) ON DELETE SET NULL,
+    visibility        text NOT NULL,              -- 'private' | 'team' | 'firm' | 'global'
+    is_published      bool NOT NULL DEFAULT false,
+    created_at        timestamptz NOT NULL DEFAULT now(),
+    updated_at        timestamptz NOT NULL DEFAULT now(),
+    deleted_at        timestamptz,
+
+    CONSTRAINT submission_building_blocks_visibility_check
+        CHECK (visibility IN ('private', 'team', 'firm', 'global')),
+    CONSTRAINT submission_building_blocks_unique_slug_per_firm
+        UNIQUE (slug, firm)
+);
+
+CREATE INDEX IF NOT EXISTS submission_building_blocks_section_visibility_idx
+    ON paliad.submission_building_blocks (section_key, visibility, firm, proceeding_family)
+    WHERE deleted_at IS NULL AND is_published;
+
+CREATE INDEX IF NOT EXISTS submission_building_blocks_author_idx
+    ON paliad.submission_building_blocks (author_id)
+    WHERE deleted_at IS NULL;
+
+ALTER TABLE paliad.submission_building_blocks ENABLE ROW LEVEL SECURITY;
+
+-- SELECT policy: coarse-grained RLS that admits every non-deleted
+-- block to any authenticated user. The Go-side BuildingBlockService
+-- applies the fine-grained tier predicate (private / team / firm /
+-- global) using branding.Name + team-membership joins. This split
+-- keeps the SQL simple and lets the tier semantics evolve in code
+-- without RLS migrations.
+--
+-- The exception below is 'private': only the author sees their own
+-- private rows. That's the hard line where a tier upgrade is
+-- substantive enough to warrant DB-level enforcement.
+DROP POLICY IF EXISTS submission_building_blocks_select ON paliad.submission_building_blocks;
+CREATE POLICY submission_building_blocks_select
+    ON paliad.submission_building_blocks FOR SELECT TO authenticated
+    USING (
+        deleted_at IS NULL
+        AND (
+            visibility <> 'private'
+            OR author_id = auth.uid()
+        )
+    );
+
+-- INSERT / UPDATE / DELETE intentionally absent — admin mutations
+-- happen at the Go handler layer with explicit adminGate. RLS without
+-- mutation policies denies them by default.
+
+DROP TRIGGER IF EXISTS submission_building_blocks_set_updated_at ON paliad.submission_building_blocks;
+CREATE TRIGGER submission_building_blocks_set_updated_at
+    BEFORE UPDATE ON paliad.submission_building_blocks
+    FOR EACH ROW EXECUTE FUNCTION paliad.tg_set_updated_at();
+
+COMMENT ON TABLE paliad.submission_building_blocks IS
+    't-paliad-315: Composer building-block library. Plain text paste sources for section content (no lineage tracked on sections per Q2 ratification). 4-tier visibility per Q9.';
+
+
+-- _admin_versions: append-only history per block. Admin-side only;
+-- not referenced from submission_sections. Retention 20 per block,
+-- GCed in the same transaction as the Save (mirrors email-templates).
+CREATE TABLE IF NOT EXISTS paliad.submission_building_block_admin_versions (
+    id                uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+    building_block_id uuid NOT NULL REFERENCES paliad.submission_building_blocks(id) ON DELETE CASCADE,
+    content_md_de     text NOT NULL,
+    content_md_en     text NOT NULL,
+    title_de          text NOT NULL,
+    title_en          text NOT NULL,
+    edited_by         uuid REFERENCES paliad.users(id) ON DELETE SET NULL,
+    note              text,
+    created_at        timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS submission_building_block_admin_versions_block_idx
+    ON paliad.submission_building_block_admin_versions (building_block_id, created_at DESC);
+
+ALTER TABLE paliad.submission_building_block_admin_versions ENABLE ROW LEVEL SECURITY;
+
+-- Admin-only audit; the handler layer gates this via adminGate and
+-- writes via SECURITY DEFINER paths or admin-role SQL. No RLS SELECT
+-- policy exists, so non-admin users get an empty result set.
+
+COMMENT ON TABLE paliad.submission_building_block_admin_versions IS
+    't-paliad-315: append-only history per building block. Admin-side only; retention 20 rows per block, GCed at Save time.';

internal/handlers/files.go

@@ -3,6 +3,7 @@ package handlers
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -12,6 +13,7 @@ import (
 	"time"
 
 	"mgit.msbls.de/m/paliad/internal/branding"
+	"mgit.msbls.de/m/paliad/internal/services"
 )
 
 const (
@@ -402,6 +404,35 @@ func fetchFirmSkeletonBytes(ctx context.Context) ([]byte, string, error) {
 	return fetchSubmissionTemplateSlug(ctx, firmSkeletonSubmissionSlug)
 }
 
+// composerBaseSlugMap routes a Composer base.slug to the existing
+// fileRegistry slug whose Gitea object backs it (t-paliad-313 Slice B).
+// Slice A seeded two bases that already share .docx files with the v1
+// fallback chain — no new Gitea uploads needed for those. Future bases
+// (e.g. lg-duesseldorf, upc-formal in Slice E) register their own
+// fileRegistry entries via the same shape and add a row here.
+var composerBaseSlugMap = map[string]string{
+	"hlc-letterhead": firmSkeletonSubmissionSlug,
+	"neutral":        skeletonSubmissionSlug,
+}
+
+// fetchComposerBaseBytes returns the .docx bytes for a Composer base,
+// pulled from the shared Gitea proxy cache. ErrComposerBaseNotProxied
+// when the slug has no registered fileRegistry entry — a base authored
+// without a file-registry mapping (rare; admin oversight) renders as
+// "Vorlagenbasis nicht erreichbar" upstream of this call.
+var ErrComposerBaseNotProxied = errors.New("composer base: Gitea slug not registered")
+
+func fetchComposerBaseBytes(ctx context.Context, base *services.SubmissionBase) ([]byte, string, error) {
+	if base == nil {
+		return nil, "", fmt.Errorf("composer base: nil base")
+	}
+	slug, ok := composerBaseSlugMap[base.Slug]
+	if !ok {
+		return nil, "", fmt.Errorf("%w: base slug %q", ErrComposerBaseNotProxied, base.Slug)
+	}
+	return fetchSubmissionTemplateSlug(ctx, slug)
+}
+
 // fetchSubmissionTemplateSlug is the shared cache-aware fetcher used by
 // the firm-skeleton and universal-skeleton accessors. Factored out so
 // the two paths can't drift apart on caching semantics.

internal/handlers/handlers.go

@@ -116,10 +116,27 @@ type Services struct {
 	// t-paliad-238 — dedicated Submissions/Schriftsätze editor.
 	SubmissionDraft *services.SubmissionDraftService
 
+	// t-paliad-313 (m/paliad#141) Composer Slice A + B — base catalog,
+	// per-draft section rows, render-pipeline assembler. All three
+	// nil in DATABASE_URL-less deploys (the Composer surfaces return
+	// 503 / hide the picker).
+	SubmissionBase     *services.BaseService
+	SubmissionSection  *services.SectionService
+	SubmissionComposer *services.SubmissionComposer
+
+	// t-paliad-315 Composer Slice C — building-block library + admin
+	// editor. Per Q2: paste sources only, no lineage on sections.
+	SubmissionBuildingBlock *services.BuildingBlockService
+
 	// t-paliad-265 / m/paliad#96 — per-event-card optional choices on
 	// the Verfahrensablauf timeline.
 	EventChoice *services.EventChoiceService
 
+	// Slice D (m/paliad#124 §5, mig 145) — named scenario compositions
+	// per project or as abstract templates. Nil when DATABASE_URL is
+	// unset; the /api/scenarios routes return 503 in that case.
+	Scenario *services.ScenarioService
+
 	// Paliadin is wired when DATABASE_URL is set. The concrete backend
 	// is picked in cmd/server/main.go based on PALIADIN_REMOTE_HOST
 	// (remote → mRiver via SSH) or local tmux availability. Stays nil
@@ -182,8 +199,13 @@ func Register(mux *http.ServeMux, client *auth.Client, giteaAPIToken string, svc
 			projection:      svc.Projection,
 			export:          svc.Export,
 			backup:          svc.Backup,
-			submissionDraft: svc.SubmissionDraft,
-			eventChoice:     svc.EventChoice,
+			submissionDraft:         svc.SubmissionDraft,
+			submissionBase:          svc.SubmissionBase,
+			submissionSection:       svc.SubmissionSection,
+			submissionComposer:      svc.SubmissionComposer,
+			submissionBuildingBlock: svc.SubmissionBuildingBlock,
+			eventChoice:       svc.EventChoice,
+			scenario:          svc.Scenario,
 		}
 	}
 
@@ -402,6 +424,18 @@ func Register(mux *http.ServeMux, client *auth.Client, giteaAPIToken string, svc
 	protected.HandleFunc("PATCH /api/submission-drafts/{draft_id}", handleGlobalPatchSubmissionDraft)
 	protected.HandleFunc("DELETE /api/submission-drafts/{draft_id}", handleGlobalDeleteSubmissionDraft)
 	protected.HandleFunc("POST /api/submission-drafts/{draft_id}/export", handleGlobalExportSubmissionDraft)
+	// t-paliad-313 (m/paliad#141) Composer Slice A — base catalog for
+	// the sidebar picker. Wide-open SELECT (any authenticated user);
+	// admin mutations are not exposed yet (Slice C).
+	protected.HandleFunc("GET /api/submission-bases", handleListSubmissionBases)
+	// t-paliad-313 (m/paliad#141) Composer Slice B — per-section PATCH
+	// for inline editor autosave. URL keyed on draft_id + section_id;
+	// owner-scoped via SubmissionDraftService.Get.
+	protected.HandleFunc("PATCH /api/submission-drafts/{draft_id}/sections/{section_id}", handlePatchSubmissionSection)
+	// t-paliad-315 (m/paliad#141) Composer Slice C — building blocks
+	// library. Lawyer-facing picker + paste mechanic.
+	protected.HandleFunc("GET /api/submission-building-blocks", handleListBuildingBlocks)
+	protected.HandleFunc("POST /api/submission-building-blocks/{block_id}/insert-into/{section_id}", handleInsertBlockIntoSection)
 	// t-paliad-277 / m/paliad#109 — refresh project-derived variables on
 	// the draft. Strips overrides for project.* / parties.* / deadline.*
 	// / procedural_event.* / rule.* prefixes and bumps last_imported_at.
@@ -446,6 +480,15 @@ func Register(mux *http.ServeMux, client *auth.Client, giteaAPIToken string, svc
 	protected.HandleFunc("PUT /api/projects/{id}/event-choices", handlePutProjectEventChoice)
 	protected.HandleFunc("DELETE /api/projects/{id}/event-choices/{submission_code}/{choice_kind}", handleDeleteProjectEventChoice)
 
+	// Slice D (m/paliad#124 §5, mig 145) — named scenario compositions
+	// per project or as abstract templates on /tools/verfahrensablauf.
+	protected.HandleFunc("GET /api/scenarios", handleScenariosList)
+	protected.HandleFunc("GET /api/scenarios/{id}", handleScenarioGet)
+	protected.HandleFunc("POST /api/scenarios", handleScenarioCreate)
+	protected.HandleFunc("PATCH /api/scenarios/{id}", handleScenarioPatch)
+	protected.HandleFunc("DELETE /api/scenarios/{id}", handleScenarioDelete)
+	protected.HandleFunc("PUT /api/projects/{id}/active-scenario", handleSetActiveScenario)
+
 	// Partner units (structural partner-led units; legacy "Dezernate").
 	protected.HandleFunc("GET /api/partner-units", handleListPartnerUnits)
 	protected.HandleFunc("POST /api/partner-units", handleCreatePartnerUnit)
@@ -657,6 +700,16 @@ func Register(mux *http.ServeMux, client *auth.Client, giteaAPIToken string, svc
 		protected.HandleFunc("DELETE /api/admin/firm-dashboard-default", adminGate(users, handleDeleteFirmDashboardDefault))
 		protected.HandleFunc("POST /api/me/dashboard-layout/promote", adminGate(users, handlePromoteDashboardLayoutToFirmDefault))
 
+		// t-paliad-315 (m/paliad#141) Composer Slice C — admin building blocks editor.
+		protected.HandleFunc("GET /admin/submission-building-blocks", adminGate(users, gateOnboarded(handleAdminBuildingBlocksPage)))
+		protected.HandleFunc("GET /api/admin/submission-building-blocks", adminGate(users, handleAdminListBuildingBlocks))
+		protected.HandleFunc("POST /api/admin/submission-building-blocks", adminGate(users, handleAdminCreateBuildingBlock))
+		protected.HandleFunc("GET /api/admin/submission-building-blocks/{block_id}", adminGate(users, handleAdminGetBuildingBlock))
+		protected.HandleFunc("PATCH /api/admin/submission-building-blocks/{block_id}", adminGate(users, handleAdminUpdateBuildingBlock))
+		protected.HandleFunc("DELETE /api/admin/submission-building-blocks/{block_id}", adminGate(users, handleAdminDeleteBuildingBlock))
+		protected.HandleFunc("GET /api/admin/submission-building-blocks/{block_id}/versions", adminGate(users, handleAdminListBuildingBlockVersions))
+		protected.HandleFunc("POST /api/admin/submission-building-blocks/{block_id}/restore/{version_id}", adminGate(users, handleAdminRestoreBuildingBlockVersion))
+
 		protected.HandleFunc("GET /api/admin/email-templates", adminGate(users, handleAdminListEmailTemplates))
 		protected.HandleFunc("GET /api/admin/email-templates/{key}/variables", adminGate(users, handleAdminEmailTemplateVariables))
 		protected.HandleFunc("GET /api/admin/email-templates/{key}/{lang}", adminGate(users, handleAdminGetEmailTemplate))

internal/handlers/paliadin.go

@@ -24,6 +24,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"log"
 	"net/http"
 	"strconv"
 	"strings"
@@ -360,6 +361,8 @@ func runStreamingTurn(turnID uuid.UUID, req services.TurnRequest, ch chan<- turn
 				convID = ev.ConversationID
 			case services.StreamError:
 				errorEmitted = true
+				log.Printf("paliadin: stream error turn=%s code=%s retryable=%v message=%q",
+					turnID, ev.Code, ev.Retryable, ev.Message)
 				send(ch, turnEvent{
 					Kind: "error",
 					Data: map[string]any{
@@ -372,6 +375,8 @@ func runStreamingTurn(turnID uuid.UUID, req services.TurnRequest, ch chan<- turn
 		case <-silenceTicker.C:
 			elapsed := time.Since(lastEventAt)
 			if elapsed >= silenceTimeout {
+				log.Printf("paliadin: silence timeout turn=%s elapsed=%s (silenceTimeout=%s)",
+					turnID, elapsed, silenceTimeout)
 				send(ch, turnEvent{
 					Kind: "error",
 					Data: map[string]any{
@@ -419,6 +424,8 @@ func runStreamingTurn(turnID uuid.UUID, req services.TurnRequest, ch chan<- turn
 				}
 			}
 			if res.err != nil {
+				log.Printf("paliadin: backend returned error turn=%s err=%v errorEmittedAlready=%v",
+					turnID, res.err, errorEmitted)
 				if !errorEmitted {
 					send(ch, turnEvent{
 						Kind: "error",
@@ -432,6 +439,8 @@ func runStreamingTurn(turnID uuid.UUID, req services.TurnRequest, ch chan<- turn
 			}
 			result := res.result
 			if result == nil {
+				log.Printf("paliadin: backend returned nil result without error turn=%s errorEmittedAlready=%v",
+					turnID, errorEmitted)
 				// Shouldn't happen — backend contract returns either err
 				// or a result. Defensive bail.
 				if !errorEmitted {

internal/handlers/projects.go

@@ -69,8 +69,19 @@ type dbServices struct {
 	// t-paliad-238 — submission draft editor.
 	submissionDraft *services.SubmissionDraftService
 
+	// t-paliad-313 — Composer base catalog + per-draft sections +
+	// (Slice B) the render pipeline assembling base + sections into a
+	// final .docx + (Slice C) building-block library.
+	submissionBase          *services.BaseService
+	submissionSection       *services.SectionService
+	submissionComposer      *services.SubmissionComposer
+	submissionBuildingBlock *services.BuildingBlockService
+
 	// t-paliad-265 — per-event-card optional choices.
 	eventChoice *services.EventChoiceService
+
+	// Slice D — named scenario compositions (m/paliad#124 §5).
+	scenario *services.ScenarioService
 }
 
 var dbSvc *dbServices

internal/handlers/scenarios.go

@@ -0,0 +1,216 @@
+package handlers
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+
+	"github.com/google/uuid"
+
+	"mgit.msbls.de/m/paliad/internal/services"
+	lp "mgit.msbls.de/m/paliad/pkg/litigationplanner"
+)
+
+// Slice D (m/paliad#124 §5, mig 145) — REST endpoints for paliad.scenarios.
+//
+// Routes (registered in handlers.go):
+//
+//	GET    /api/scenarios?project=<id>     — list project's scenarios
+//	GET    /api/scenarios?abstract=true    — list caller's abstract scenarios
+//	GET    /api/scenarios/{id}             — fetch one
+//	POST   /api/scenarios                  — create
+//	PATCH  /api/scenarios/{id}             — partial update
+//	PUT    /api/projects/{id}/active-scenario  — set/clear active scenario
+//	DELETE /api/scenarios/{id}             — remove
+//
+// All endpoints require auth; visibility is enforced by
+// ScenarioService.requireProjectVisible / requireVisible.
+
+func requireScenarioService(w http.ResponseWriter) bool {
+	if dbSvc == nil || dbSvc.scenario == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{
+			"error": "Szenarien sind vorübergehend nicht verfügbar (keine Datenbank).",
+		})
+		return false
+	}
+	return true
+}
+
+// scenarioErrorToStatus maps service errors to HTTP statuses. Mirrors
+// the patterns in projects.go and event_choices.go.
+func scenarioErrorToStatus(err error) (int, string) {
+	switch {
+	case errors.Is(err, lp.ErrUnknownScenario), errors.Is(err, services.ErrScenarioNotVisible):
+		return http.StatusNotFound, "Szenario nicht gefunden"
+	case errors.Is(err, services.ErrInvalidInput), errors.Is(err, lp.ErrInvalidScenario), errors.Is(err, lp.ErrScenarioNoPrimary):
+		return http.StatusBadRequest, err.Error()
+	}
+	return http.StatusInternalServerError, err.Error()
+}
+
+// handleScenariosList — GET /api/scenarios?project=<uuid> OR ?abstract=true.
+func handleScenariosList(w http.ResponseWriter, r *http.Request) {
+	if !requireScenarioService(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+
+	abstract := r.URL.Query().Get("abstract") == "true"
+	projectStr := r.URL.Query().Get("project")
+	switch {
+	case abstract:
+		out, err := dbSvc.scenario.ListAbstractForUser(r.Context(), uid)
+		if err != nil {
+			status, msg := scenarioErrorToStatus(err)
+			writeJSON(w, status, map[string]string{"error": msg})
+			return
+		}
+		writeJSON(w, http.StatusOK, out)
+	case projectStr != "":
+		pid, err := uuid.Parse(projectStr)
+		if err != nil {
+			writeJSON(w, http.StatusBadRequest, map[string]string{"error": "ungültige project ID"})
+			return
+		}
+		out, err := dbSvc.scenario.ListForProject(r.Context(), uid, pid)
+		if err != nil {
+			status, msg := scenarioErrorToStatus(err)
+			writeJSON(w, status, map[string]string{"error": msg})
+			return
+		}
+		writeJSON(w, http.StatusOK, out)
+	default:
+		writeJSON(w, http.StatusBadRequest, map[string]string{
+			"error": "?project=<uuid> oder ?abstract=true erforderlich",
+		})
+	}
+}
+
+// handleScenarioGet — GET /api/scenarios/{id}.
+func handleScenarioGet(w http.ResponseWriter, r *http.Request) {
+	if !requireScenarioService(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	id, err := uuid.Parse(r.PathValue("id"))
+	if err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "ungültige ID"})
+		return
+	}
+	out, err := dbSvc.scenario.Get(r.Context(), uid, id)
+	if err != nil {
+		status, msg := scenarioErrorToStatus(err)
+		writeJSON(w, status, map[string]string{"error": msg})
+		return
+	}
+	writeJSON(w, http.StatusOK, out)
+}
+
+// handleScenarioCreate — POST /api/scenarios.
+func handleScenarioCreate(w http.ResponseWriter, r *http.Request) {
+	if !requireScenarioService(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	var input services.CreateScenarioInput
+	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "ungültige Anfrage"})
+		return
+	}
+	out, err := dbSvc.scenario.Create(r.Context(), uid, input)
+	if err != nil {
+		status, msg := scenarioErrorToStatus(err)
+		writeJSON(w, status, map[string]string{"error": msg})
+		return
+	}
+	writeJSON(w, http.StatusCreated, out)
+}
+
+// handleScenarioPatch — PATCH /api/scenarios/{id}.
+func handleScenarioPatch(w http.ResponseWriter, r *http.Request) {
+	if !requireScenarioService(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	id, err := uuid.Parse(r.PathValue("id"))
+	if err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "ungültige ID"})
+		return
+	}
+	var input services.PatchScenarioInput
+	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "ungültige Anfrage"})
+		return
+	}
+	out, err := dbSvc.scenario.Patch(r.Context(), uid, id, input)
+	if err != nil {
+		status, msg := scenarioErrorToStatus(err)
+		writeJSON(w, status, map[string]string{"error": msg})
+		return
+	}
+	writeJSON(w, http.StatusOK, out)
+}
+
+// handleScenarioDelete — DELETE /api/scenarios/{id}.
+func handleScenarioDelete(w http.ResponseWriter, r *http.Request) {
+	if !requireScenarioService(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	id, err := uuid.Parse(r.PathValue("id"))
+	if err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "ungültige ID"})
+		return
+	}
+	if err := dbSvc.scenario.Delete(r.Context(), uid, id); err != nil {
+		status, msg := scenarioErrorToStatus(err)
+		writeJSON(w, status, map[string]string{"error": msg})
+		return
+	}
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// handleSetActiveScenario — PUT /api/projects/{id}/active-scenario.
+// Body: {"scenario_id": "<uuid>"} or {"scenario_id": null} to clear.
+func handleSetActiveScenario(w http.ResponseWriter, r *http.Request) {
+	if !requireScenarioService(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	pid, err := uuid.Parse(r.PathValue("id"))
+	if err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "ungültige project ID"})
+		return
+	}
+	var body struct {
+		ScenarioID *uuid.UUID `json:"scenario_id"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "ungültige Anfrage"})
+		return
+	}
+	if err := dbSvc.scenario.SetActive(r.Context(), uid, pid, body.ScenarioID); err != nil {
+		status, msg := scenarioErrorToStatus(err)
+		writeJSON(w, status, map[string]string{"error": msg})
+		return
+	}
+	w.WriteHeader(http.StatusNoContent)
+}

internal/handlers/submission_bases.go

@@ -0,0 +1,96 @@
+package handlers
+
+// Submission base catalog handler — Composer Slice A (t-paliad-313,
+// m/paliad#141, design doc docs/design-submission-generator-v2-2026-05-26.md
+// §5.1 / Slice A acceptance).
+//
+// Endpoint: GET /api/submission-bases  → list of active bases visible
+// to the requesting firm. The sidebar picker on the draft editor reads
+// this once on page load and caches in-memory; the response shape is
+// stable across the picker's lifetime.
+//
+// Visibility: the catalog is shared firm-wide (per the design + mig
+// 146's wide-open RLS SELECT policy). The handler still requires
+// authentication; anonymous users 401.
+//
+// Filtering: the response includes the firm's own bases AND the
+// firm-agnostic ones (firm IS NULL). The Go service-side filter passes
+// branding.Name as the firm hint; cross-firm cases (e.g. a future
+// non-HLC deployment) get their own filtered slice naturally.
+
+import (
+	"net/http"
+
+	"mgit.msbls.de/m/paliad/internal/branding"
+	"mgit.msbls.de/m/paliad/internal/services"
+)
+
+// submissionBaseRow is the on-the-wire shape returned by the list
+// endpoint. Mirrors services.SubmissionBase but drops the raw bytes
+// and exposes the parsed section spec inline so the picker can show a
+// preview of the default section count without an extra round-trip.
+type submissionBaseRow struct {
+	ID               string   `json:"id"`
+	Slug             string   `json:"slug"`
+	Firm             *string  `json:"firm,omitempty"`
+	ProceedingFamily *string  `json:"proceeding_family,omitempty"`
+	LabelDE          string   `json:"label_de"`
+	LabelEN          string   `json:"label_en"`
+	DescriptionDE    *string  `json:"description_de,omitempty"`
+	DescriptionEN    *string  `json:"description_en,omitempty"`
+	GiteaPath        string   `json:"gitea_path"`
+	IsDefaultFor     []string `json:"is_default_for"`
+	IsActive         bool     `json:"is_active"`
+	SectionCount     int      `json:"section_count"`
+}
+
+type submissionBaseListResponse struct {
+	Bases []submissionBaseRow `json:"bases"`
+}
+
+// handleListSubmissionBases backs GET /api/submission-bases.
+func handleListSubmissionBases(w http.ResponseWriter, r *http.Request) {
+	if !requireDB(w) {
+		return
+	}
+	if _, ok := requireUser(w, r); !ok {
+		return
+	}
+	if dbSvc.submissionBase == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{
+			"error": "submission bases not configured",
+		})
+		return
+	}
+
+	rows, err := dbSvc.submissionBase.List(r.Context(), branding.Name)
+	if err != nil {
+		writeServiceError(w, err)
+		return
+	}
+
+	out := make([]submissionBaseRow, 0, len(rows))
+	for i := range rows {
+		out = append(out, baseRowFromService(&rows[i]))
+	}
+	writeJSON(w, http.StatusOK, submissionBaseListResponse{Bases: out})
+}
+
+// baseRowFromService projects a services.SubmissionBase into the
+// on-the-wire row shape.
+func baseRowFromService(b *services.SubmissionBase) submissionBaseRow {
+	return submissionBaseRow{
+		ID:               b.ID.String(),
+		Slug:             b.Slug,
+		Firm:             b.Firm,
+		ProceedingFamily: b.ProceedingFamily,
+		LabelDE:          b.LabelDE,
+		LabelEN:          b.LabelEN,
+		DescriptionDE:    b.DescriptionDE,
+		DescriptionEN:    b.DescriptionEN,
+		GiteaPath:        b.GiteaPath,
+		IsDefaultFor:     b.IsDefaultFor,
+		IsActive:         b.IsActive,
+		SectionCount:     len(b.SectionSpec.Defaults),
+	}
+}

internal/handlers/submission_building_blocks.go

@@ -0,0 +1,482 @@
+package handlers
+
+// Composer building-block handlers — t-paliad-315 Slice C.
+//
+// Two surfaces:
+//
+//  1. Lawyer-facing picker (any authenticated user):
+//       GET  /api/submission-building-blocks?section_key=…&proceeding_family=…&q=…
+//       POST /api/submission-building-blocks/{block_id}/insert-into/{section_id}
+//
+//     The picker list is visibility-tier-filtered (private/team/firm/
+//     global) at the service layer. Insert is the paste mechanic
+//     ratified by Q2 (m, 2026-05-26): plain text copy of
+//     content_md_<lang> into submission_sections.content_md_<lang>.
+//     No lineage stamped on the section.
+//
+//  2. Admin editor (adminGate via auth.RequireAdminFunc):
+//       GET    /api/admin/submission-building-blocks
+//       POST   /api/admin/submission-building-blocks
+//       GET    /api/admin/submission-building-blocks/{block_id}
+//       PATCH  /api/admin/submission-building-blocks/{block_id}
+//       DELETE /api/admin/submission-building-blocks/{block_id}
+//       GET    /api/admin/submission-building-blocks/{block_id}/versions
+//       POST   /api/admin/submission-building-blocks/{block_id}/restore/{version_id}
+//
+//     Plus the page route /admin/submission-building-blocks (list +
+//     edit shell, hydrated client-side).
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/google/uuid"
+
+	"mgit.msbls.de/m/paliad/internal/services"
+)
+
+// blockJSON is the on-the-wire shape for both the picker and admin
+// surfaces.
+type buildingBlockJSON struct {
+	ID               uuid.UUID  `json:"id"`
+	Slug             string     `json:"slug"`
+	Firm             *string    `json:"firm,omitempty"`
+	SectionKey       string     `json:"section_key"`
+	ProceedingFamily *string    `json:"proceeding_family,omitempty"`
+	TitleDE          string     `json:"title_de"`
+	TitleEN          string     `json:"title_en"`
+	DescriptionDE    *string    `json:"description_de,omitempty"`
+	DescriptionEN    *string    `json:"description_en,omitempty"`
+	ContentMDDE      string     `json:"content_md_de"`
+	ContentMDEN      string     `json:"content_md_en"`
+	AuthorID         *uuid.UUID `json:"author_id,omitempty"`
+	Visibility       string     `json:"visibility"`
+	IsPublished      bool       `json:"is_published"`
+	CreatedAt        time.Time  `json:"created_at"`
+	UpdatedAt        time.Time  `json:"updated_at"`
+}
+
+type buildingBlockListResponse struct {
+	Blocks []buildingBlockJSON `json:"blocks"`
+}
+
+// blockJSONFromService projects services.BuildingBlock into the wire shape.
+func blockJSONFromService(b *services.BuildingBlock) buildingBlockJSON {
+	return buildingBlockJSON{
+		ID:               b.ID,
+		Slug:             b.Slug,
+		Firm:             b.Firm,
+		SectionKey:       b.SectionKey,
+		ProceedingFamily: b.ProceedingFamily,
+		TitleDE:          b.TitleDE,
+		TitleEN:          b.TitleEN,
+		DescriptionDE:    b.DescriptionDE,
+		DescriptionEN:    b.DescriptionEN,
+		ContentMDDE:      b.ContentMDDE,
+		ContentMDEN:      b.ContentMDEN,
+		AuthorID:         b.AuthorID,
+		Visibility:       b.Visibility,
+		IsPublished:      b.IsPublished,
+		CreatedAt:        b.CreatedAt,
+		UpdatedAt:        b.UpdatedAt,
+	}
+}
+
+// ─────────────────────────────────────────────────────────────────────
+// Lawyer-facing picker
+// ─────────────────────────────────────────────────────────────────────
+
+func handleListBuildingBlocks(w http.ResponseWriter, r *http.Request) {
+	if !requireDB(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	if dbSvc.submissionBuildingBlock == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "building blocks not configured"})
+		return
+	}
+	q := r.URL.Query()
+	filter := services.BlockListFilter{
+		SectionKey:       strings.TrimSpace(q.Get("section_key")),
+		ProceedingFamily: strings.TrimSpace(q.Get("proceeding_family")),
+		Search:           strings.TrimSpace(q.Get("q")),
+	}
+	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
+	defer cancel()
+
+	rows, err := dbSvc.submissionBuildingBlock.ListVisible(ctx, uid, filter)
+	if err != nil {
+		writeServiceError(w, err)
+		return
+	}
+	out := make([]buildingBlockJSON, 0, len(rows))
+	for i := range rows {
+		out = append(out, blockJSONFromService(&rows[i]))
+	}
+	writeJSON(w, http.StatusOK, buildingBlockListResponse{Blocks: out})
+}
+
+func handleInsertBlockIntoSection(w http.ResponseWriter, r *http.Request) {
+	if !requireDB(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	if dbSvc.submissionBuildingBlock == nil || dbSvc.submissionSection == nil || dbSvc.submissionDraft == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "building blocks not configured"})
+		return
+	}
+	blockID, ok := parseUUIDPath(w, r, "block_id", "block id")
+	if !ok {
+		return
+	}
+	sectionID, ok := parseUUIDPath(w, r, "section_id", "section id")
+	if !ok {
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(r.Context(), 10*time.Second)
+	defer cancel()
+
+	// Visibility on the section: section.draft_id must point to a
+	// draft the caller owns. Composer Slice B's same owner gate.
+	sec, err := dbSvc.submissionSection.Get(ctx, sectionID)
+	if err != nil {
+		if errors.Is(err, services.ErrSubmissionSectionNotFound) {
+			writeJSON(w, http.StatusNotFound, map[string]string{"error": "section not found"})
+			return
+		}
+		writeServiceError(w, err)
+		return
+	}
+	if _, err := dbSvc.submissionDraft.Get(ctx, uid, sec.DraftID); err != nil {
+		writeSubmissionDraftServiceError(w, err)
+		return
+	}
+
+	updated, err := dbSvc.submissionBuildingBlock.InsertIntoSection(ctx, uid, blockID, sectionID, dbSvc.submissionSection)
+	if err != nil {
+		if errors.Is(err, services.ErrBuildingBlockNotFound) {
+			writeJSON(w, http.StatusNotFound, map[string]string{"error": "block not found"})
+			return
+		}
+		if errors.Is(err, services.ErrSubmissionSectionNotFound) {
+			writeJSON(w, http.StatusNotFound, map[string]string{"error": "section not found"})
+			return
+		}
+		writeServiceError(w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, sectionJSONFromService(updated))
+}
+
+// ─────────────────────────────────────────────────────────────────────
+// Admin editor
+// ─────────────────────────────────────────────────────────────────────
+
+func handleAdminListBuildingBlocks(w http.ResponseWriter, r *http.Request) {
+	if !requireDB(w) {
+		return
+	}
+	if dbSvc.submissionBuildingBlock == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "building blocks not configured"})
+		return
+	}
+	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
+	defer cancel()
+	rows, err := dbSvc.submissionBuildingBlock.ListAllForAdmin(ctx)
+	if err != nil {
+		writeServiceError(w, err)
+		return
+	}
+	out := make([]buildingBlockJSON, 0, len(rows))
+	for i := range rows {
+		out = append(out, blockJSONFromService(&rows[i]))
+	}
+	writeJSON(w, http.StatusOK, buildingBlockListResponse{Blocks: out})
+}
+
+func handleAdminGetBuildingBlock(w http.ResponseWriter, r *http.Request) {
+	if !requireDB(w) {
+		return
+	}
+	if dbSvc.submissionBuildingBlock == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "building blocks not configured"})
+		return
+	}
+	blockID, ok := parseUUIDPath(w, r, "block_id", "block id")
+	if !ok {
+		return
+	}
+	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
+	defer cancel()
+	b, err := dbSvc.submissionBuildingBlock.GetForAdmin(ctx, blockID)
+	if err != nil {
+		if errors.Is(err, services.ErrBuildingBlockNotFound) {
+			writeJSON(w, http.StatusNotFound, map[string]string{"error": "block not found"})
+			return
+		}
+		writeServiceError(w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, blockJSONFromService(b))
+}
+
+type buildingBlockCreateInput struct {
+	Slug             string  `json:"slug"`
+	Firm             *string `json:"firm,omitempty"`
+	SectionKey       string  `json:"section_key"`
+	ProceedingFamily *string `json:"proceeding_family,omitempty"`
+	TitleDE          string  `json:"title_de"`
+	TitleEN          string  `json:"title_en"`
+	DescriptionDE    *string `json:"description_de,omitempty"`
+	DescriptionEN    *string `json:"description_en,omitempty"`
+	ContentMDDE      string  `json:"content_md_de"`
+	ContentMDEN      string  `json:"content_md_en"`
+	Visibility       string  `json:"visibility"`
+	IsPublished      bool    `json:"is_published"`
+}
+
+func handleAdminCreateBuildingBlock(w http.ResponseWriter, r *http.Request) {
+	if !requireDB(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	if dbSvc.submissionBuildingBlock == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "building blocks not configured"})
+		return
+	}
+	var in buildingBlockCreateInput
+	if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid JSON"})
+		return
+	}
+	ctx, cancel := context.WithTimeout(r.Context(), 10*time.Second)
+	defer cancel()
+	b, err := dbSvc.submissionBuildingBlock.Create(ctx, uid, services.CreateInput{
+		Slug:             in.Slug,
+		Firm:             in.Firm,
+		SectionKey:       in.SectionKey,
+		ProceedingFamily: in.ProceedingFamily,
+		TitleDE:          in.TitleDE,
+		TitleEN:          in.TitleEN,
+		DescriptionDE:    in.DescriptionDE,
+		DescriptionEN:    in.DescriptionEN,
+		ContentMDDE:      in.ContentMDDE,
+		ContentMDEN:      in.ContentMDEN,
+		Visibility:       in.Visibility,
+		IsPublished:      in.IsPublished,
+	})
+	if err != nil {
+		if errors.Is(err, services.ErrInvalidInput) || errors.Is(err, services.ErrBuildingBlockInvalidVisibility) {
+			writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
+			return
+		}
+		writeServiceError(w, err)
+		return
+	}
+	writeJSON(w, http.StatusCreated, blockJSONFromService(b))
+}
+
+type buildingBlockUpdateInput struct {
+	Slug             *string `json:"slug,omitempty"`
+	Firm             *string `json:"firm,omitempty"`
+	FirmSet          bool    `json:"-"`
+	SectionKey       *string `json:"section_key,omitempty"`
+	ProceedingFamily *string `json:"proceeding_family,omitempty"`
+	ProceedingFamilySet bool `json:"-"`
+	TitleDE          *string `json:"title_de,omitempty"`
+	TitleEN          *string `json:"title_en,omitempty"`
+	DescriptionDE    *string `json:"description_de,omitempty"`
+	DescriptionDESet bool    `json:"-"`
+	DescriptionEN    *string `json:"description_en,omitempty"`
+	DescriptionENSet bool    `json:"-"`
+	ContentMDDE      *string `json:"content_md_de,omitempty"`
+	ContentMDEN      *string `json:"content_md_en,omitempty"`
+	Visibility       *string `json:"visibility,omitempty"`
+	IsPublished      *bool   `json:"is_published,omitempty"`
+	Note             *string `json:"note,omitempty"`
+}
+
+func (u *buildingBlockUpdateInput) UnmarshalJSON(data []byte) error {
+	type alias buildingBlockUpdateInput
+	var a alias
+	if err := json.Unmarshal(data, &a); err != nil {
+		return err
+	}
+	*u = buildingBlockUpdateInput(a)
+	raw := map[string]json.RawMessage{}
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return err
+	}
+	_, u.FirmSet = raw["firm"]
+	_, u.ProceedingFamilySet = raw["proceeding_family"]
+	_, u.DescriptionDESet = raw["description_de"]
+	_, u.DescriptionENSet = raw["description_en"]
+	return nil
+}
+
+func handleAdminUpdateBuildingBlock(w http.ResponseWriter, r *http.Request) {
+	if !requireDB(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	if dbSvc.submissionBuildingBlock == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "building blocks not configured"})
+		return
+	}
+	blockID, ok := parseUUIDPath(w, r, "block_id", "block id")
+	if !ok {
+		return
+	}
+	var in buildingBlockUpdateInput
+	if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid JSON"})
+		return
+	}
+	patch := services.UpdatePatch{
+		Slug:        in.Slug,
+		SectionKey:  in.SectionKey,
+		TitleDE:     in.TitleDE,
+		TitleEN:     in.TitleEN,
+		ContentMDDE: in.ContentMDDE,
+		ContentMDEN: in.ContentMDEN,
+		Visibility:  in.Visibility,
+		IsPublished: in.IsPublished,
+		Note:        in.Note,
+	}
+	if in.FirmSet {
+		patch.Firm = &in.Firm
+	}
+	if in.ProceedingFamilySet {
+		patch.ProceedingFamily = &in.ProceedingFamily
+	}
+	if in.DescriptionDESet {
+		patch.DescriptionDE = &in.DescriptionDE
+	}
+	if in.DescriptionENSet {
+		patch.DescriptionEN = &in.DescriptionEN
+	}
+	ctx, cancel := context.WithTimeout(r.Context(), 10*time.Second)
+	defer cancel()
+	b, err := dbSvc.submissionBuildingBlock.Update(ctx, uid, blockID, patch)
+	if err != nil {
+		if errors.Is(err, services.ErrBuildingBlockNotFound) {
+			writeJSON(w, http.StatusNotFound, map[string]string{"error": "block not found"})
+			return
+		}
+		if errors.Is(err, services.ErrBuildingBlockInvalidVisibility) {
+			writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
+			return
+		}
+		writeServiceError(w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, blockJSONFromService(b))
+}
+
+func handleAdminDeleteBuildingBlock(w http.ResponseWriter, r *http.Request) {
+	if !requireDB(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	if dbSvc.submissionBuildingBlock == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "building blocks not configured"})
+		return
+	}
+	blockID, ok := parseUUIDPath(w, r, "block_id", "block id")
+	if !ok {
+		return
+	}
+	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
+	defer cancel()
+	if err := dbSvc.submissionBuildingBlock.SoftDelete(ctx, uid, blockID); err != nil {
+		if errors.Is(err, services.ErrBuildingBlockNotFound) {
+			writeJSON(w, http.StatusNotFound, map[string]string{"error": "block not found"})
+			return
+		}
+		writeServiceError(w, err)
+		return
+	}
+	writeJSON(w, http.StatusNoContent, nil)
+}
+
+func handleAdminListBuildingBlockVersions(w http.ResponseWriter, r *http.Request) {
+	if !requireDB(w) {
+		return
+	}
+	if dbSvc.submissionBuildingBlock == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "building blocks not configured"})
+		return
+	}
+	blockID, ok := parseUUIDPath(w, r, "block_id", "block id")
+	if !ok {
+		return
+	}
+	ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
+	defer cancel()
+	rows, err := dbSvc.submissionBuildingBlock.ListVersions(ctx, blockID)
+	if err != nil {
+		writeServiceError(w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]any{"versions": rows})
+}
+
+func handleAdminRestoreBuildingBlockVersion(w http.ResponseWriter, r *http.Request) {
+	if !requireDB(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	if dbSvc.submissionBuildingBlock == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "building blocks not configured"})
+		return
+	}
+	blockID, ok := parseUUIDPath(w, r, "block_id", "block id")
+	if !ok {
+		return
+	}
+	versionID, ok := parseUUIDPath(w, r, "version_id", "version id")
+	if !ok {
+		return
+	}
+	ctx, cancel := context.WithTimeout(r.Context(), 10*time.Second)
+	defer cancel()
+	b, err := dbSvc.submissionBuildingBlock.RestoreVersion(ctx, uid, blockID, versionID)
+	if err != nil {
+		if errors.Is(err, services.ErrBuildingBlockNotFound) {
+			writeJSON(w, http.StatusNotFound, map[string]string{"error": "block or version not found"})
+			return
+		}
+		writeServiceError(w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, blockJSONFromService(b))
+}
+
+// handleAdminBuildingBlocksPage serves the admin editor shell. The
+// client bundle hydrates the list + edit UI.
+func handleAdminBuildingBlocksPage(w http.ResponseWriter, r *http.Request) {
+	http.ServeFile(w, r, "dist/admin-submission-building-blocks.html")
+}

internal/handlers/submission_drafts.go

@@ -83,6 +83,11 @@ type submissionDraftView struct {
 	// so the frontend can render the multi-select picker in one round-
 	// trip. Empty when the draft has no project attached.
 	AvailableParties []submissionDraftPartyJSON `json:"available_parties"`
+	// Sections is the per-draft section stack (t-paliad-313 Slice A).
+	// Slice A renders these read-only; the lawyer sees what the
+	// Composer seeded but can't yet edit prose. nil for pre-Composer
+	// drafts (base_id NULL, no submission_sections rows).
+	Sections []submissionSectionJSON `json:"sections"`
 }
 
 // submissionDraftPartyJSON is the minimal party row the editor sidebar
@@ -106,8 +111,30 @@ type submissionDraftJSON struct {
 	LastExportedAt  *time.Time              `json:"last_exported_at,omitempty"`
 	LastExportedSHA *string                 `json:"last_exported_sha,omitempty"`
 	LastImportedAt  *time.Time              `json:"last_imported_at,omitempty"`
-	CreatedAt       time.Time               `json:"created_at"`
-	UpdatedAt       time.Time               `json:"updated_at"`
+	// BaseID — Composer base reference (t-paliad-313). NULL on
+	// pre-Composer drafts; the editor sidebar surfaces this in the
+	// base picker. PATCH accepts {"base_id": "<uuid>"} or
+	// {"base_id": null} to set or clear.
+	BaseID       *uuid.UUID     `json:"base_id"`
+	ComposerMeta map[string]any `json:"composer_meta"`
+	CreatedAt    time.Time      `json:"created_at"`
+	UpdatedAt    time.Time      `json:"updated_at"`
+}
+
+// submissionSectionJSON is the on-the-wire row for each per-draft
+// section. Slice A renders these read-only — the lawyer sees the
+// section stack but doesn't yet edit prose. Slice B makes content_md_*
+// editable + adds the PATCH endpoint.
+type submissionSectionJSON struct {
+	ID           uuid.UUID `json:"id"`
+	SectionKey   string    `json:"section_key"`
+	OrderIndex   int       `json:"order_index"`
+	Kind         string    `json:"kind"`
+	LabelDE      string    `json:"label_de"`
+	LabelEN      string    `json:"label_en"`
+	Included     bool      `json:"included"`
+	ContentMDDE  string    `json:"content_md_de"`
+	ContentMDEN  string    `json:"content_md_en"`
 }
 
 type submissionRuleSummary struct {
@@ -132,6 +159,41 @@ type submissionDraftPatchInput struct {
 	Variables       *services.PlaceholderMap `json:"variables,omitempty"`
 	SelectedParties *[]uuid.UUID             `json:"selected_parties,omitempty"`
 	Language        *string                  `json:"language,omitempty"`
+	// BaseID accepts three states per the JSON contract:
+	//   field absent              → no change (json:"-")
+	//   {"base_id": "<uuid>"}     → set to picked base
+	//   {"base_id": null}         → clear (return to v1 fallback)
+	// We model this with a **uuid.UUID inside a custom UnmarshalJSON
+	// in case extends; for now the simpler `*uuid.UUID` + presence
+	// flag covers Slice A's set-base flow. Clearing is exposed but
+	// rarely used (the editor always picks a base; clearing is for
+	// admin-recovery flows).
+	BaseID    *uuid.UUID `json:"base_id,omitempty"`
+	BaseIDSet bool       `json:"-"`
+}
+
+// UnmarshalJSON on submissionDraftPatchInput sets BaseIDSet=true if
+// the "base_id" key appears in the payload (regardless of whether
+// the value is null or a uuid string). Lets the handler distinguish
+// "field absent" (no change) from "field set to null" (clear).
+func (p *submissionDraftPatchInput) UnmarshalJSON(data []byte) error {
+	// Phase 1: decode into a raw map to detect key presence.
+	raw := map[string]json.RawMessage{}
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return err
+	}
+	// Phase 2: decode the typed fields. Use an alias to skip this
+	// custom UnmarshalJSON during the re-parse.
+	type alias submissionDraftPatchInput
+	var a alias
+	if err := json.Unmarshal(data, &a); err != nil {
+		return err
+	}
+	*p = submissionDraftPatchInput(a)
+	if _, ok := raw["base_id"]; ok {
+		p.BaseIDSet = true
+	}
+	return nil
 }
 
 // ─────────────────────────────────────────────────────────────────────
@@ -372,6 +434,9 @@ func handlePatchSubmissionDraft(w http.ResponseWriter, r *http.Request) {
 		SelectedParties: input.SelectedParties,
 		Language:        input.Language,
 	}
+	if input.BaseIDSet {
+		patch.BaseID = &input.BaseID
+	}
 	d, err := dbSvc.submissionDraft.Update(r.Context(), uid, draftID, patch)
 	if err != nil {
 		writeSubmissionDraftServiceError(w, err)
@@ -501,16 +566,10 @@ func handleExportSubmissionDraft(w http.ResponseWriter, r *http.Request) {
 		writeSubmissionDraftServiceError(w, err)
 		return
 	}
-	tplBytes, tplSHA, _, err := resolveSubmissionTemplate(ctx, d.SubmissionCode, d.Language)
+	docx, resolved, tplSHA, composerUsed, err := exportSubmissionDraft(ctx, d)
 	if err != nil {
-		log.Printf("submission_drafts: export template fetch (draft=%s): %v", draftID, err)
-		writeJSON(w, http.StatusBadGateway, map[string]string{"error": "template upstream unreachable"})
-		return
-	}
-	docx, resolved, err := dbSvc.submissionDraft.Export(ctx, d, tplBytes)
-	if err != nil {
-		log.Printf("submission_drafts: export render (draft=%s): %v", draftID, err)
-		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": "render failed"})
+		log.Printf("submission_drafts: export (draft=%s): %v", draftID, err)
+		writeSubmissionExportError(w, err)
 		return
 	}
 
@@ -523,7 +582,7 @@ func handleExportSubmissionDraft(w http.ResponseWriter, r *http.Request) {
 	if err := dbSvc.submissionDraft.MarkExported(bgCtx, d.ID, tplSHA); err != nil {
 		log.Printf("submission_drafts: mark exported (draft=%s): %v", draftID, err)
 	}
-	if err := writeSubmissionDraftAuditRow(bgCtx, resolved.User, d, filename, tplSHA); err != nil {
+	if err := writeSubmissionDraftAuditRow(bgCtx, resolved.User, d, filename, tplSHA, composerUsed); err != nil {
 		log.Printf("submission_drafts: audit insert failed (draft=%s): %v", draftID, err)
 	}
 	if err := writeSubmissionDraftProjectEvent(bgCtx, d, resolved, filename); err != nil {
@@ -538,6 +597,82 @@ func handleExportSubmissionDraft(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+// exportSubmissionDraft is the shared render entry point used by both
+// the project-scoped and global export handlers (t-paliad-313 Slice B).
+// Branches on draft.BaseID: if set AND the base + bytes resolve, the
+// Composer pipeline assembles the document; otherwise the v1
+// template-only path stays the fallback. composerUsed = true means the
+// metadata jsonb on the audit row carries "composer": true so admins
+// can tell the two paths apart in the feed.
+//
+// Returns (bytes, resolved-bag, templateSHA, composerUsed, err).
+func exportSubmissionDraft(ctx context.Context, d *services.SubmissionDraft) ([]byte, *services.SubmissionVarsResult, string, bool, error) {
+	if d.BaseID != nil && dbSvc.submissionBase != nil && dbSvc.submissionSection != nil && dbSvc.submissionComposer != nil {
+		base, err := dbSvc.submissionBase.GetByID(ctx, *d.BaseID)
+		switch {
+		case err == nil:
+			baseBytes, baseSHA, err := fetchComposerBaseBytes(ctx, base)
+			if err == nil {
+				sections, err := dbSvc.submissionSection.ListForDraft(ctx, d.ID)
+				if err != nil {
+					return nil, nil, "", false, fmt.Errorf("list sections: %w", err)
+				}
+				bag, resolved, err := dbSvc.submissionDraft.BuildRenderBag(ctx, d)
+				if err != nil {
+					return nil, nil, "", false, err
+				}
+				docx, err := dbSvc.submissionComposer.Compose(ctx, services.ComposeOptions{
+					Sections:  sections,
+					Base:      base,
+					BaseBytes: baseBytes,
+					Lang:      resolved.Lang,
+					Vars:      bag,
+					Missing:   services.DefaultMissingMarker(resolved.Lang),
+				})
+				if err != nil {
+					return nil, nil, "", false, fmt.Errorf("composer: %w", err)
+				}
+				return docx, resolved, baseSHA, true, nil
+			}
+			log.Printf("submission_drafts: composer base bytes fetch failed (draft=%s base=%s): %v — falling back to v1 path", d.ID, base.Slug, err)
+		case errors.Is(err, services.ErrBaseNotFound):
+			log.Printf("submission_drafts: composer base missing (draft=%s base_id=%s) — falling back to v1 path", d.ID, *d.BaseID)
+		default:
+			return nil, nil, "", false, fmt.Errorf("composer base lookup: %w", err)
+		}
+	}
+
+	// v1 fallback: template-only render via resolveSubmissionTemplate +
+	// SubmissionDraftService.Export. Unchanged behaviour for
+	// pre-Composer drafts.
+	tplBytes, tplSHA, _, err := resolveSubmissionTemplate(ctx, d.SubmissionCode, d.Language)
+	if err != nil {
+		return nil, nil, "", false, fmt.Errorf("template upstream: %w", err)
+	}
+	docx, resolved, err := dbSvc.submissionDraft.Export(ctx, d, tplBytes)
+	if err != nil {
+		return nil, nil, "", false, fmt.Errorf("render: %w", err)
+	}
+	return docx, resolved, tplSHA, false, nil
+}
+
+// writeSubmissionExportError maps a render-time error to an HTTP
+// response. The shape mirrors what the handlers used to inline.
+func writeSubmissionExportError(w http.ResponseWriter, err error) {
+	if err == nil {
+		return
+	}
+	msg := err.Error()
+	switch {
+	case strings.Contains(msg, "template upstream"):
+		writeJSON(w, http.StatusBadGateway, map[string]string{"error": "template upstream unreachable"})
+	case strings.Contains(msg, "composer:") || strings.Contains(msg, "render:") || strings.Contains(msg, "list sections"):
+		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": "render failed"})
+	default:
+		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": "render failed"})
+	}
+}
+
 // handleSubmissionDraftPage serves dist/submission-draft.html for the
 // dedicated draft editor at /projects/{id}/submissions/{code}/draft
 // (and …/draft/{draft_id}). Project visibility is enforced server-side
@@ -713,6 +848,11 @@ type globalDraftPatchInput struct {
 	// SelectedParties: present-but-empty array resets to "all parties",
 	// present non-empty array restricts to subset, absent = no change.
 	SelectedParties *[]uuid.UUID `json:"selected_parties,omitempty"`
+	// BaseID + baseIDProvided mirror the ProjectID pattern — present
+	// (regardless of value) means "set"; absent means "no change". Set
+	// by UnmarshalJSON. t-paliad-313 Composer Slice A.
+	BaseID         *uuid.UUID `json:"base_id,omitempty"`
+	baseIDProvided bool
 }
 
 func (g *globalDraftPatchInput) UnmarshalJSON(data []byte) error {
@@ -722,6 +862,7 @@ func (g *globalDraftPatchInput) UnmarshalJSON(data []byte) error {
 		Language        *string                  `json:"language,omitempty"`
 		ProjectID       *uuid.UUID               `json:"project_id,omitempty"`
 		SelectedParties *[]uuid.UUID             `json:"selected_parties,omitempty"`
+		BaseID          *uuid.UUID               `json:"base_id,omitempty"`
 	}
 	var a alias
 	if err := json.Unmarshal(data, &a); err != nil {
@@ -732,12 +873,15 @@ func (g *globalDraftPatchInput) UnmarshalJSON(data []byte) error {
 	g.Language = a.Language
 	g.ProjectID = a.ProjectID
 	g.SelectedParties = a.SelectedParties
-	// Detect whether "project_id" was present in the JSON object.
+	g.BaseID = a.BaseID
+	// Detect whether "project_id" / "base_id" were present in the JSON
+	// object.
 	var raw map[string]json.RawMessage
 	if err := json.Unmarshal(data, &raw); err != nil {
 		return err
 	}
 	_, g.projectIDProvided = raw["project_id"]
+	_, g.baseIDProvided = raw["base_id"]
 	return nil
 }
 
@@ -778,6 +922,10 @@ func handleGlobalPatchSubmissionDraft(w http.ResponseWriter, r *http.Request) {
 		pid := in.ProjectID // may be nil → detach
 		patch.ProjectID = &pid
 	}
+	if in.baseIDProvided {
+		bid := in.BaseID // may be nil → clear
+		patch.BaseID = &bid
+	}
 
 	d, err := dbSvc.submissionDraft.Update(r.Context(), uid, draftID, patch)
 	if err != nil {
@@ -890,16 +1038,10 @@ func handleGlobalExportSubmissionDraft(w http.ResponseWriter, r *http.Request) {
 		writeSubmissionDraftServiceError(w, err)
 		return
 	}
-	tplBytes, tplSHA, _, err := resolveSubmissionTemplate(ctx, d.SubmissionCode, d.Language)
+	docx, resolved, tplSHA, composerUsed, err := exportSubmissionDraft(ctx, d)
 	if err != nil {
-		log.Printf("submission_drafts: export template fetch (draft=%s): %v", draftID, err)
-		writeJSON(w, http.StatusBadGateway, map[string]string{"error": "template upstream unreachable"})
-		return
-	}
-	docx, resolved, err := dbSvc.submissionDraft.Export(ctx, d, tplBytes)
-	if err != nil {
-		log.Printf("submission_drafts: export render (draft=%s): %v", draftID, err)
-		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": "render failed"})
+		log.Printf("submission_drafts: export (draft=%s): %v", draftID, err)
+		writeSubmissionExportError(w, err)
 		return
 	}
 
@@ -910,7 +1052,7 @@ func handleGlobalExportSubmissionDraft(w http.ResponseWriter, r *http.Request) {
 	if err := dbSvc.submissionDraft.MarkExported(bgCtx, d.ID, tplSHA); err != nil {
 		log.Printf("submission_drafts: mark exported (draft=%s): %v", draftID, err)
 	}
-	if err := writeSubmissionDraftAuditRow(bgCtx, resolved.User, d, filename, tplSHA); err != nil {
+	if err := writeSubmissionDraftAuditRow(bgCtx, resolved.User, d, filename, tplSHA, composerUsed); err != nil {
 		log.Printf("submission_drafts: audit insert failed (draft=%s): %v", draftID, err)
 	}
 	if err := writeSubmissionDraftProjectEvent(bgCtx, d, resolved, filename); err != nil {
@@ -952,6 +1094,30 @@ func buildSubmissionDraftView(ctx context.Context, d *services.SubmissionDraft,
 		Lang:             lang,
 		HasTemplate:      true,
 		AvailableParties: []submissionDraftPartyJSON{},
+		Sections:         []submissionSectionJSON{},
+	}
+
+	// Composer Slice A — surface seeded sections (read-only). Empty
+	// when the draft has no base + no section rows (pre-Composer
+	// drafts that haven't been auto-upgraded — that's Slice C).
+	if dbSvc.submissionSection != nil {
+		secs, err := dbSvc.submissionSection.ListForDraft(ctx, d.ID)
+		if err != nil {
+			return nil, err
+		}
+		for _, sec := range secs {
+			view.Sections = append(view.Sections, submissionSectionJSON{
+				ID:          sec.ID,
+				SectionKey:  sec.SectionKey,
+				OrderIndex:  sec.OrderIndex,
+				Kind:        sec.Kind,
+				LabelDE:     sec.LabelDE,
+				LabelEN:     sec.LabelEN,
+				Included:    sec.Included,
+				ContentMDDE: sec.ContentMDDE,
+				ContentMDEN: sec.ContentMDEN,
+			})
+		}
 	}
 
 	merged, resolved, err := dbSvc.submissionDraft.BuildRenderBag(ctx, d)
@@ -1135,6 +1301,10 @@ func draftToJSON(d *services.SubmissionDraft) submissionDraftJSON {
 	if lang == "" {
 		lang = "de"
 	}
+	meta := d.ComposerMeta
+	if meta == nil {
+		meta = map[string]any{}
+	}
 	return submissionDraftJSON{
 		ID:              d.ID,
 		ProjectID:       d.ProjectID,
@@ -1147,6 +1317,8 @@ func draftToJSON(d *services.SubmissionDraft) submissionDraftJSON {
 		LastExportedAt:  d.LastExportedAt,
 		LastExportedSHA: d.LastExportedSHA,
 		LastImportedAt:  d.LastImportedAt,
+		BaseID:          d.BaseID,
+		ComposerMeta:    meta,
 		CreatedAt:       d.CreatedAt,
 		UpdatedAt:       d.UpdatedAt,
 	}
@@ -1160,7 +1332,7 @@ func draftToJSON(d *services.SubmissionDraft) submissionDraftJSON {
 // 'user' with scope_root = draft.user_id; the audit feed therefore
 // surfaces these exports on the user's row rather than against a
 // (non-existent) project.
-func writeSubmissionDraftAuditRow(ctx context.Context, user *models.User, d *services.SubmissionDraft, filename, templateSHA string) error {
+func writeSubmissionDraftAuditRow(ctx context.Context, user *models.User, d *services.SubmissionDraft, filename, templateSHA string, composerUsed bool) error {
 	meta := map[string]any{
 		"submission_code": d.SubmissionCode,
 		"draft_id":        d.ID.String(),
@@ -1168,6 +1340,15 @@ func writeSubmissionDraftAuditRow(ctx context.Context, user *models.User, d *ser
 		"filename":        filename,
 		"template_sha":    templateSHA,
 	}
+	// t-paliad-313 Slice B — composer flag in metadata so admins can
+	// tell the two render paths apart in the audit feed without
+	// adding a new event_type.
+	if composerUsed {
+		meta["composer"] = true
+		if d.BaseID != nil {
+			meta["base_id"] = d.BaseID.String()
+		}
+	}
 	body, _ := json.Marshal(meta)
 	var (
 		actorID    any

internal/handlers/submission_sections.go

@@ -0,0 +1,148 @@
+package handlers
+
+// Submission section handlers — Composer Slice B (t-paliad-313). Backs
+// the inline editor on /projects/{id}/submissions/{code}/draft/{draft_id}
+// where the lawyer types prose into each section.
+//
+// Endpoint:
+//
+//   PATCH /api/submission-drafts/{draft_id}/sections/{section_id}
+//
+// Body shape (all fields optional — absent = no change):
+//
+//   {
+//     "content_md_de": "...",
+//     "content_md_en": "...",
+//     "included": true|false,
+//     "label_de": "...",
+//     "label_en": "...",
+//     "order_index": 3
+//   }
+//
+// Visibility: ownership of the draft is checked via
+// SubmissionDraftService.Get (404 on no-access), then the section is
+// fetched + verified to belong to that draft. The DB-side RLS policy
+// (mig 148) enforces the same gate independently.
+//
+// Returns 200 + the refreshed section row on success.
+//
+// This is global-scoped (no /projects/{id}/ prefix) because the
+// section's owning draft already carries the project_id; routing on
+// section_id alone keeps the URL shape stable across project-scoped
+// and project-less drafts.
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"time"
+
+	"mgit.msbls.de/m/paliad/internal/services"
+)
+
+// submissionSectionPatchInput is the JSON shape accepted by PATCH.
+type submissionSectionPatchInput struct {
+	ContentMDDE *string `json:"content_md_de,omitempty"`
+	ContentMDEN *string `json:"content_md_en,omitempty"`
+	Included    *bool   `json:"included,omitempty"`
+	LabelDE     *string `json:"label_de,omitempty"`
+	LabelEN     *string `json:"label_en,omitempty"`
+	OrderIndex  *int    `json:"order_index,omitempty"`
+}
+
+// submissionSectionPatchTimeout caps the round-trip.
+const submissionSectionPatchTimeout = 10 * time.Second
+
+func handlePatchSubmissionSection(w http.ResponseWriter, r *http.Request) {
+	if !requireDB(w) {
+		return
+	}
+	uid, ok := requireUser(w, r)
+	if !ok {
+		return
+	}
+	if dbSvc.submissionDraft == nil || dbSvc.submissionSection == nil {
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "submission sections not configured"})
+		return
+	}
+	draftID, ok := parseUUIDPath(w, r, "draft_id", "draft id")
+	if !ok {
+		return
+	}
+	sectionID, ok := parseUUIDPath(w, r, "section_id", "section id")
+	if !ok {
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(r.Context(), submissionSectionPatchTimeout)
+	defer cancel()
+
+	// Owner-scope on the draft (RLS mirror; this gives us the typed
+	// 404 + the path for the "section belongs to a different draft"
+	// case below).
+	draft, err := dbSvc.submissionDraft.Get(ctx, uid, draftID)
+	if err != nil {
+		writeSubmissionDraftServiceError(w, err)
+		return
+	}
+
+	existing, err := dbSvc.submissionSection.Get(ctx, sectionID)
+	if err != nil {
+		if errors.Is(err, services.ErrSubmissionSectionNotFound) {
+			writeJSON(w, http.StatusNotFound, map[string]string{"error": "section not found"})
+			return
+		}
+		writeServiceError(w, err)
+		return
+	}
+	if existing.DraftID != draft.ID {
+		// Section exists but doesn't belong to this draft — surface as
+		// 404 to keep the "no fishing for foreign drafts" property.
+		writeJSON(w, http.StatusNotFound, map[string]string{"error": "section not found"})
+		return
+	}
+
+	var input submissionSectionPatchInput
+	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid JSON"})
+		return
+	}
+
+	patch := services.SectionPatch{
+		ContentMDDE: input.ContentMDDE,
+		ContentMDEN: input.ContentMDEN,
+		Included:    input.Included,
+		LabelDE:     input.LabelDE,
+		LabelEN:     input.LabelEN,
+		OrderIndex:  input.OrderIndex,
+	}
+	updated, err := dbSvc.submissionSection.Update(ctx, sectionID, patch)
+	if err != nil {
+		if errors.Is(err, services.ErrSubmissionSectionNotFound) {
+			writeJSON(w, http.StatusNotFound, map[string]string{"error": "section not found"})
+			return
+		}
+		writeServiceError(w, err)
+		return
+	}
+
+	writeJSON(w, http.StatusOK, sectionJSONFromService(updated))
+}
+
+// sectionJSONFromService projects a services.SubmissionSection into the
+// JSON shape the editor consumes — the same shape buildSubmissionDraftView
+// emits under .sections[].
+func sectionJSONFromService(sec *services.SubmissionSection) submissionSectionJSON {
+	return submissionSectionJSON{
+		ID:          sec.ID,
+		SectionKey:  sec.SectionKey,
+		OrderIndex:  sec.OrderIndex,
+		Kind:        sec.Kind,
+		LabelDE:     sec.LabelDE,
+		LabelEN:     sec.LabelEN,
+		Included:    sec.Included,
+		ContentMDDE: sec.ContentMDDE,
+		ContentMDEN: sec.ContentMDEN,
+	}
+}

internal/handlers/submissions.go

@@ -200,7 +200,7 @@ func loadSubmissionCatalog(ctx context.Context, projectProceedingTypeID *int) ([
 		        pt.code                AS proceeding_code,
 		        pt.name                AS proceeding_name,
 		        pt.name_en             AS proceeding_name_en
-		   FROM paliad.deadline_rules dr
+		   FROM paliad.deadline_rules_unified dr
 		   JOIN paliad.proceeding_types pt ON pt.id = dr.proceeding_type_id
 		  WHERE dr.is_active = true
 		    AND dr.lifecycle_state = 'published'
@@ -208,7 +208,7 @@ func loadSubmissionCatalog(ctx context.Context, projectProceedingTypeID *int) ([
 		    AND dr.submission_code IS NOT NULL
 		    AND dr.submission_code <> ''
 		    AND pt.is_active = true
-		  ORDER BY pt.code ASC, dr.submission_code ASC`)
+		  ORDER BY pt.code ASC, dr.sequence_order ASC, dr.submission_code ASC`)
 	if err != nil {
 		return nil, nil, err
 	}

internal/services/aichat_paliadin_stream.go

@@ -220,6 +220,14 @@ func (s *AichatPaliadinService) RunTurnStream(ctx context.Context, req TurnReque
 	}
 
 	if streamErr != nil {
+		// Aichat persona without streaming support — graceful fallback to
+		// the one-shot /chat/turn endpoint. Same body shape; we adapt the
+		// non-streaming response into a single StreamChunk so the caller
+		// sees identical event ordering.
+		if strings.Contains(streamErr.Error(), "unsupported_streaming") {
+			log.Printf("paliadin: persona %q lacks streaming support — falling back to one-shot turn %s", s.cfg.Persona, turnID)
+			return s.fallbackOneShotFromStream(ctx, turnID, body, events, startedAt, session)
+		}
 		// Don't overwrite an existing error_code we may have set above.
 		_ = s.markTurnError(ctx, turnID, classifyAichatError(streamErr))
 		return nil, streamErr
@@ -255,6 +263,80 @@ func (s *AichatPaliadinService) RunTurnStream(ctx context.Context, req TurnReque
 	}, nil
 }
 
+// fallbackOneShotFromStream runs the same `body` against aichat's
+// non-streaming /chat/turn endpoint and adapts the response into the
+// StreamingPaliadin contract — a single StreamChunk + StreamMeta +
+// StreamConversation, followed by `events` being closed by the
+// outer RunTurnStream's defer. Used when the configured persona doesn't
+// support streaming (aichat returns HTTP 400 unsupported_streaming).
+//
+// Identical persistence shape as the one-shot RunTurn: completeTurn +
+// markPrimed/clearPrimed. No new turn row (already inserted by
+// RunTurnStream). No primer rebuild (already in body).
+func (s *AichatPaliadinService) fallbackOneShotFromStream(
+	ctx context.Context,
+	turnID uuid.UUID,
+	body aichatTurnRequest,
+	events chan<- StreamEvent,
+	startedAt time.Time,
+	session string,
+) (*TurnResult, error) {
+	var resp aichatTurnResponse
+	if err := s.callHTTP(ctx, http.MethodPost, "/chat/turn", body, &resp); err != nil {
+		_ = s.markTurnError(ctx, turnID, classifyAichatError(err))
+		safeSendStream(ctx, events, StreamEvent{
+			Kind:    StreamError,
+			Code:    classifyAichatError(err),
+			Message: err.Error(),
+		})
+		return nil, err
+	}
+
+	if resp.PaneSpawned {
+		s.clearPrimed(session)
+	} else {
+		s.markPrimed(session)
+	}
+
+	cleanBody := resp.Response
+	tokens := approxTokenCount(cleanBody)
+	chipCount := countChips(cleanBody)
+	finished := time.Now().UTC()
+	durationMS := int(finished.Sub(startedAt) / time.Millisecond)
+
+	tmeta := trailerMeta{
+		UsedTools:     resp.Meta.UsedTools,
+		ClassifierTag: resp.Meta.ClassifierTag,
+		RowsSeen:      coerceAichatRowsSeen(resp.Meta.RowsSeen),
+	}
+
+	// Emit the response as a single chunk so the frontend renders it.
+	safeSendStream(ctx, events, StreamEvent{
+		Kind:    StreamChunk,
+		Content: cleanBody,
+	})
+	safeSendStream(ctx, events, StreamEvent{
+		Kind:          StreamMeta,
+		UsedTools:     tmeta.UsedTools,
+		ClassifierTag: tmeta.ClassifierTag,
+		RowsSeen:      tmeta.RowsSeen,
+	})
+
+	if err := s.completeTurn(ctx, turnID, finished, durationMS, cleanBody, tokens, tmeta, chipCount); err != nil {
+		log.Printf("paliadin: complete turn %s (fallback one-shot): %v", turnID, err)
+	}
+
+	return &TurnResult{
+		TurnID:        turnID,
+		Response:      cleanBody,
+		UsedTools:     tmeta.UsedTools,
+		RowsSeen:      tmeta.RowsSeen,
+		ChipCount:     chipCount,
+		ClassifierTag: tmeta.ClassifierTag,
+		DurationMS:    durationMS,
+	}, nil
+}
+
 // streamFrame is one decoded SSE event.
 type streamFrame struct {
 	event     string // "" → default (data:) event

internal/services/backup_service_live_test.go

@@ -0,0 +1,99 @@
+package services
+
+import (
+	"bytes"
+	"context"
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+	_ "github.com/lib/pq"
+)
+
+// TestResolveOrgSheets_LiveSchemaSnapshot probes the live paliad schema
+// the way the backup runner does at the start of every run, then asserts
+// that every spec the registry declares either keeps all its ORDER BY
+// columns or — if any are missing — composes a fallback SELECT that the
+// DB can still execute. Catches the m/paliad#140 class of bug
+// (hardcoded ORDER BY against a renamed column) before deploy.
+//
+// Skipped when TEST_DATABASE_URL is unset. Read-only: opens a
+// REPEATABLE READ tx, never writes.
+func TestResolveOrgSheets_LiveSchemaSnapshot(t *testing.T) {
+	url := os.Getenv("TEST_DATABASE_URL")
+	if url == "" {
+		t.Skip("TEST_DATABASE_URL not set — skipping live DB test")
+	}
+	pool, err := sqlx.Connect("postgres", url)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	defer pool.Close()
+
+	ctx := context.Background()
+	specs := orgSheetSpecs()
+	sheets, err := resolveOrgSheets(ctx, pool, specs)
+	if err != nil {
+		t.Fatalf("resolveOrgSheets: %v", err)
+	}
+	if len(sheets) != len(specs) {
+		t.Fatalf("resolved %d sheets, want %d", len(sheets), len(specs))
+	}
+
+	// Each resolved SELECT must run cleanly against the live schema.
+	// We LIMIT 1 inside a sub-SELECT so we don't materialise the full
+	// table (some are large) but still exercise the ORDER BY clause.
+	for _, sq := range sheets {
+		wrapped := `SELECT * FROM (` + sq.SQL + `) _wrap LIMIT 1`
+		if _, err := pool.QueryxContext(ctx, wrapped, sq.Args...); err != nil {
+			t.Errorf("sheet %q SQL failed: %v\nSQL: %s", sq.SheetName, err, sq.SQL)
+		}
+	}
+}
+
+// TestWriteOrg_LiveSmoke runs the full ExportService.WriteOrg pipeline
+// against a real DB: schema probe, REPEATABLE READ tx, every sheet
+// query, xlsx + json + per-sheet CSV assembly, outer zip framing.
+// Discards the bytes — this is a "does it crash" smoke, the bug class
+// it catches is exactly the one from m/paliad#140 (hardcoded ORDER BY
+// against a missing column).
+//
+// Skipped when TEST_DATABASE_URL is unset.
+func TestWriteOrg_LiveSmoke(t *testing.T) {
+	url := os.Getenv("TEST_DATABASE_URL")
+	if url == "" {
+		t.Skip("TEST_DATABASE_URL not set — skipping live DB test")
+	}
+	pool, err := sqlx.Connect("postgres", url)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	defer pool.Close()
+
+	svc := NewExportService(pool, "test-firm")
+	var buf bytes.Buffer
+	meta, err := svc.WriteOrg(context.Background(), &buf, ExportSpec{
+		ActorID:    uuid.New(),
+		ActorEmail: "backup-smoke@test.local",
+		ActorLabel: "Backup Smoke",
+	})
+	if err != nil {
+		t.Fatalf("WriteOrg: %v", err)
+	}
+	if buf.Len() == 0 {
+		t.Fatalf("WriteOrg wrote no bytes")
+	}
+	// Spot-check meta fills.
+	if meta.Scope != ExportScopeOrg {
+		t.Errorf("meta.Scope = %q, want %q", meta.Scope, ExportScopeOrg)
+	}
+	if len(meta.RowCounts) != len(orgSheetSpecs()) {
+		t.Errorf("meta.RowCounts has %d entries, want %d (one per sheet)", len(meta.RowCounts), len(orgSheetSpecs()))
+	}
+	// The bytes are a zip; the first 4 bytes are PK\x03\x04 for a non-empty zip.
+	if buf.Len() >= 4 && !strings.HasPrefix(buf.String()[:4], "PK\x03\x04") {
+		t.Errorf("bundle bytes don't look like a zip (first bytes: %x)", buf.Bytes()[:4])
+	}
+}

internal/services/backup_service_test.go

@@ -6,8 +6,10 @@ package services
 // it would live in backup_service_live_test.go under TEST_DATABASE_URL.
 // This file covers the bits that don't need a database:
 //
-//   - orgSheetQueries registry shape: no duplicates, no excluded
+//   - orgSheetSpecs registry shape: no duplicates, no excluded
 //     paliadin sheets, predictable prefix split between entity and ref.
+//   - composeOrgSheetSQL drift-resistance: missing ORDER BY cols drop,
+//     SQL override path bypasses the builder, all-missing → no clause.
 //   - LocalDiskStore Put / Get / Delete round-trip, key validation,
 //     URI traversal rejection.
 
@@ -22,60 +24,216 @@ import (
 )
 
 // ---------------------------------------------------------------------------
-// orgSheetQueries registry
+// orgSheetSpecs registry
 // ---------------------------------------------------------------------------
 
-func TestOrgSheetQueries_NoDuplicates(t *testing.T) {
+func TestOrgSheetSpecs_NoDuplicates(t *testing.T) {
 	seen := map[string]bool{}
-	for _, sq := range orgSheetQueries() {
-		if seen[sq.SheetName] {
-			t.Fatalf("duplicate sheet name in orgSheetQueries: %q", sq.SheetName)
+	for _, sp := range orgSheetSpecs() {
+		if seen[sp.SheetName] {
+			t.Fatalf("duplicate sheet name in orgSheetSpecs: %q", sp.SheetName)
 		}
-		seen[sq.SheetName] = true
+		seen[sp.SheetName] = true
 	}
 }
 
-func TestOrgSheetQueries_ExcludesPaliadinTables(t *testing.T) {
+func TestOrgSheetSpecs_ExcludesPaliadinTables(t *testing.T) {
 	// m's t-paliad-214 Q5 decision + this design's §11 Q3 default:
 	// paliadin_turns and paliadin_aichat_conversation must be ABSENT
 	// from the registry (structural exclusion, not just column-drop).
-	for _, sq := range orgSheetQueries() {
-		name := sq.SheetName
+	for _, sp := range orgSheetSpecs() {
+		name := sp.SheetName
 		if strings.Contains(name, "paliadin") {
-			t.Fatalf("orgSheetQueries leaked paliadin sheet: %q (m's Q3 mandates structural exclusion)", name)
+			t.Fatalf("orgSheetSpecs leaked paliadin sheet: %q (m's Q3 mandates structural exclusion)", name)
 		}
-		// Belt-and-braces: SQL bodies should not reference the tables
-		// either (no UNION joins, no subqueries pulling them in).
-		if strings.Contains(sq.SQL, "paliadin_turns") || strings.Contains(sq.SQL, "paliadin_aichat_conversation") {
-			t.Fatalf("orgSheetQueries[%q] SQL references a paliadin table: %s", name, sq.SQL)
+		if strings.Contains(sp.Table, "paliadin") {
+			t.Fatalf("orgSheetSpecs[%q].Table references a paliadin table: %s", name, sp.Table)
+		}
+		// Belt-and-braces: SQL override bodies (the few sheets that
+		// bypass the Table+OrderBy builder) also can't pull paliadin
+		// tables in through UNION/subquery.
+		if strings.Contains(sp.SQL, "paliadin_turns") || strings.Contains(sp.SQL, "paliadin_aichat_conversation") {
+			t.Fatalf("orgSheetSpecs[%q] SQL references a paliadin table: %s", name, sp.SQL)
 		}
 	}
 }
 
-func TestOrgSheetQueries_RefSheetsPrefixed(t *testing.T) {
+func TestOrgSheetSpecs_RefSheetsPrefixed(t *testing.T) {
 	// Every sheet whose data is read-only reference material is
 	// expected to use the `ref__` prefix. The writer's downstream
 	// consumers rely on this convention to group reference data
 	// visually in the workbook.
-	for _, sq := range orgSheetQueries() {
-		if !strings.HasPrefix(sq.SheetName, "ref__") {
+	for _, sp := range orgSheetSpecs() {
+		if !strings.HasPrefix(sp.SheetName, "ref__") {
 			continue
 		}
 		// Reference sheets shouldn't carry per-row WHERE clauses (they
-		// dump the whole reference table for portability).
-		if strings.Contains(strings.ToUpper(sq.SQL), "WHERE") {
-			t.Fatalf("orgSheetQueries[%q] is ref__ but has a WHERE clause; reference sheets dump the whole table", sq.SheetName)
+		// dump the whole reference table for portability). Only
+		// applies to the SQL-override path; the Table+OrderBy builder
+		// never emits a WHERE.
+		if sp.SQL != "" && strings.Contains(strings.ToUpper(sp.SQL), "WHERE") {
+			t.Fatalf("orgSheetSpecs[%q] is ref__ but has a WHERE clause; reference sheets dump the whole table", sp.SheetName)
 		}
 	}
 }
 
-func TestOrgSheetQueries_OrderByForDeterminism(t *testing.T) {
-	// Every sheet must specify an ORDER BY so the byte-deterministic
-	// contract from t-paliad-214 §3 holds across runs.
-	for _, sq := range orgSheetQueries() {
-		if !strings.Contains(strings.ToUpper(sq.SQL), "ORDER BY") {
-			t.Fatalf("orgSheetQueries[%q] missing ORDER BY (determinism contract): %s", sq.SheetName, sq.SQL)
+func TestOrgSheetSpecs_OrderByForDeterminism(t *testing.T) {
+	// Every sheet must declare a stable sort: either OrderBy on the
+	// Table+OrderBy path, or ORDER BY in the SQL override. Keeps the
+	// byte-deterministic contract from t-paliad-214 §3 across runs.
+	//
+	// (Drift removes ORDER BY columns at runtime, but only ones that
+	// no longer exist in the schema — the spec-level declaration is
+	// still required so we know what *should* be ordered.)
+	for _, sp := range orgSheetSpecs() {
+		if sp.SQL != "" {
+			if !strings.Contains(strings.ToUpper(sp.SQL), "ORDER BY") {
+				t.Fatalf("orgSheetSpecs[%q] SQL override missing ORDER BY (determinism contract): %s", sp.SheetName, sp.SQL)
+			}
+			continue
 		}
+		if len(sp.OrderBy) == 0 {
+			t.Fatalf("orgSheetSpecs[%q] has no OrderBy and no SQL override (determinism contract)", sp.SheetName)
+		}
+	}
+}
+
+// ---------------------------------------------------------------------------
+// composeOrgSheetSQL — drift-resistant SQL builder
+// ---------------------------------------------------------------------------
+
+func TestComposeOrgSheetSQL_AllColumnsPresent(t *testing.T) {
+	spec := orgSheetSpec{
+		SheetName: "appointments",
+		Table:     "paliad.appointments",
+		OrderBy:   []string{"id"},
+	}
+	cols := map[string]map[string]struct{}{
+		"appointments": {"id": {}, "project_id": {}},
+	}
+	got, dropped := composeOrgSheetSQL(spec, cols)
+	want := "SELECT * FROM paliad.appointments ORDER BY id"
+	if got != want {
+		t.Fatalf("got SQL %q, want %q", got, want)
+	}
+	if len(dropped) != 0 {
+		t.Fatalf("expected no dropped columns, got %v", dropped)
+	}
+}
+
+func TestComposeOrgSheetSQL_DropsMissingOrderByColumn(t *testing.T) {
+	// The original bug from m/paliad#138 reproduced in unit form:
+	// orderBy references a column the table doesn't have.
+	spec := orgSheetSpec{
+		SheetName: "appointment_caldav_targets",
+		Table:     "paliad.appointment_caldav_targets",
+		OrderBy:   []string{"appointment_id", "calendar_binding_id"}, // wrong: real col is binding_id
+	}
+	cols := map[string]map[string]struct{}{
+		"appointment_caldav_targets": {
+			"appointment_id": {},
+			"binding_id":     {},
+		},
+	}
+	got, dropped := composeOrgSheetSQL(spec, cols)
+	want := "SELECT * FROM paliad.appointment_caldav_targets ORDER BY appointment_id"
+	if got != want {
+		t.Fatalf("got SQL %q, want %q", got, want)
+	}
+	if len(dropped) != 1 || dropped[0] != "calendar_binding_id" {
+		t.Fatalf("expected dropped=[calendar_binding_id], got %v", dropped)
+	}
+}
+
+func TestComposeOrgSheetSQL_AllOrderByMissing_NoClause(t *testing.T) {
+	// If every declared ORDER BY column is gone, the builder still
+	// produces a runnable SELECT — without ORDER BY. The export
+	// succeeds; the order across runs is no longer deterministic for
+	// this sheet until the spec is updated. WARN log alerts the
+	// operator (verified in TestResolveOrgSheets_LogsWarnings).
+	spec := orgSheetSpec{
+		SheetName: "ghost",
+		Table:     "paliad.ghost",
+		OrderBy:   []string{"missing_a", "missing_b"},
+	}
+	cols := map[string]map[string]struct{}{
+		"ghost": {"unrelated": {}},
+	}
+	got, dropped := composeOrgSheetSQL(spec, cols)
+	want := "SELECT * FROM paliad.ghost"
+	if got != want {
+		t.Fatalf("got SQL %q, want %q", got, want)
+	}
+	if len(dropped) != 2 {
+		t.Fatalf("expected 2 dropped columns, got %v", dropped)
+	}
+}
+
+func TestComposeOrgSheetSQL_SQLOverride_BypassesBuilder(t *testing.T) {
+	// When a sheet declares SQL, the builder MUST NOT touch it — even
+	// if the column knowledge would suggest a change. Custom
+	// projections (documents drops ai_extracted) and special-case
+	// joins both rely on this.
+	spec := orgSheetSpec{
+		SheetName: "documents",
+		Table:     "paliad.documents", // should be ignored
+		OrderBy:   []string{"id"},     // should be ignored
+		SQL:       "SELECT id, title FROM paliad.documents ORDER BY id",
+	}
+	cols := map[string]map[string]struct{}{
+		"documents": {}, // empty → would drop everything if builder ran
+	}
+	got, dropped := composeOrgSheetSQL(spec, cols)
+	if got != spec.SQL {
+		t.Fatalf("SQL override mutated: got %q, want %q", got, spec.SQL)
+	}
+	if len(dropped) != 0 {
+		t.Fatalf("override path should never report drops; got %v", dropped)
+	}
+}
+
+func TestComposeOrgSheetSQL_UnknownTable_DropsAllOrderBy(t *testing.T) {
+	// A table missing entirely from the schema snapshot is treated as
+	// "no columns known" — every ORDER BY column gets dropped, but
+	// the SELECT still emits (so a stale registry doesn't crash the
+	// backup; the operator gets WARNs to fix it).
+	spec := orgSheetSpec{
+		SheetName: "renamed_table",
+		Table:     "paliad.renamed_table",
+		OrderBy:   []string{"id"},
+	}
+	got, dropped := composeOrgSheetSQL(spec, map[string]map[string]struct{}{})
+	want := "SELECT * FROM paliad.renamed_table"
+	if got != want {
+		t.Fatalf("got SQL %q, want %q", got, want)
+	}
+	if len(dropped) != 1 || dropped[0] != "id" {
+		t.Fatalf("expected dropped=[id], got %v", dropped)
+	}
+}
+
+func TestComposeOrgSheetSQL_PreservesOrderByOrder(t *testing.T) {
+	// Multi-column OrderBy must keep its declared order, with kept
+	// columns concatenated in the same sequence. Determinism contract
+	// from t-paliad-214 §3 depends on this.
+	spec := orgSheetSpec{
+		SheetName: "partner_unit_members",
+		Table:     "paliad.partner_unit_members",
+		OrderBy:   []string{"partner_unit_id", "missing_middle", "user_id"},
+	}
+	cols := map[string]map[string]struct{}{
+		"partner_unit_members": {
+			"partner_unit_id": {},
+			"user_id":         {},
+		},
+	}
+	got, dropped := composeOrgSheetSQL(spec, cols)
+	want := "SELECT * FROM paliad.partner_unit_members ORDER BY partner_unit_id, user_id"
+	if got != want {
+		t.Fatalf("got SQL %q, want %q", got, want)
+	}
+	if len(dropped) != 1 || dropped[0] != "missing_middle" {
+		t.Fatalf("expected dropped=[missing_middle], got %v", dropped)
 	}
 }
 

internal/services/deadline_rule_service.go

@@ -40,7 +40,9 @@ const ruleColumns = `id, proceeding_type_id, parent_id, submission_code, name, n
 const proceedingTypeColumns = `id, code, name, name_en, description, jurisdiction,
 	category, default_color, sort_order, is_active,
 	trigger_event_label_de, trigger_event_label_en,
-	appeal_target`
+	appeal_target,
+	role_proactive_label_de, role_proactive_label_en,
+	role_reactive_label_de,  role_reactive_label_en`
 
 // List returns active rules, optionally filtered by proceeding type.
 // Each row has ConceptDefaultEventTypeID hydrated from
@@ -53,13 +55,13 @@ func (s *DeadlineRuleService) List(ctx context.Context, proceedingTypeID *int) (
 	if proceedingTypeID != nil {
 		err = s.db.SelectContext(ctx, &rules,
 			`SELECT `+ruleColumns+`
-			   FROM paliad.deadline_rules
+			   FROM paliad.deadline_rules_unified
 			  WHERE proceeding_type_id = $1 AND is_active = true
 			  ORDER BY sequence_order`, *proceedingTypeID)
 	} else {
 		err = s.db.SelectContext(ctx, &rules,
 			`SELECT `+ruleColumns+`
-			   FROM paliad.deadline_rules
+			   FROM paliad.deadline_rules_unified
 			  WHERE is_active = true
 			  ORDER BY proceeding_type_id, sequence_order`)
 	}
@@ -98,7 +100,7 @@ func (s *DeadlineRuleService) hydrateConceptDefaultEventTypes(ctx context.Contex
 	}
 	query, args, err := sqlx.In(
 		`SELECT dr.id AS rule_id, j.event_type_id
-		   FROM paliad.deadline_rules dr
+		   FROM paliad.deadline_rules_unified dr
 		   JOIN paliad.proceeding_types pt ON pt.id = dr.proceeding_type_id
 		   JOIN paliad.deadline_concept_event_types j
 		         ON j.concept_id = dr.concept_id
@@ -150,7 +152,7 @@ func (s *DeadlineRuleService) GetRuleTree(ctx context.Context, proceedingTypeCod
 	var rules []models.DeadlineRule
 	if err := s.db.SelectContext(ctx, &rules,
 		`SELECT `+ruleColumns+`
-		   FROM paliad.deadline_rules
+		   FROM paliad.deadline_rules_unified
 		  WHERE proceeding_type_id = $1 AND is_active = true
 		  ORDER BY sequence_order`, pt.ID); err != nil {
 		return nil, fmt.Errorf("list rules for %q: %w", proceedingTypeCode, err)
@@ -173,10 +175,10 @@ func (s *DeadlineRuleService) GetFullTimeline(ctx context.Context, proceedingTyp
 	var rules []models.DeadlineRule
 	err := s.db.SelectContext(ctx, &rules, `
 		WITH RECURSIVE tree AS (
-			SELECT * FROM paliad.deadline_rules
+			SELECT * FROM paliad.deadline_rules_unified
 			 WHERE proceeding_type_id = $1 AND parent_id IS NULL AND is_active = true
 			UNION ALL
-			SELECT dr.* FROM paliad.deadline_rules dr
+			SELECT dr.* FROM paliad.deadline_rules_unified dr
 			JOIN tree t ON dr.parent_id = t.id
 			WHERE dr.is_active = true
 		)
@@ -194,7 +196,7 @@ func (s *DeadlineRuleService) GetByIDs(ctx context.Context, ids []uuid.UUID) ([]
 	}
 	query, args, err := sqlx.In(
 		`SELECT `+ruleColumns+`
-		   FROM paliad.deadline_rules
+		   FROM paliad.deadline_rules_unified
 		  WHERE id IN (?) AND is_active = true
 		  ORDER BY sequence_order`, ids)
 	if err != nil {
@@ -262,7 +264,7 @@ func (s *DeadlineRuleService) ListByTriggerEvent(ctx context.Context, triggerEve
 	var rules []models.DeadlineRule
 	if err := s.db.SelectContext(ctx, &rules,
 		`SELECT `+ruleColumns+`
-		   FROM paliad.deadline_rules
+		   FROM paliad.deadline_rules_unified
 		  WHERE trigger_event_id = $1
 		    AND is_active = true
 		  ORDER BY sequence_order`, triggerEventID); err != nil {
@@ -290,7 +292,7 @@ func (s *DeadlineRuleService) ListByProceedingTypeIDs(ctx context.Context, ids [
 	}
 	query, args, err := sqlx.In(
 		`SELECT `+ruleColumns+`
-		   FROM paliad.deadline_rules
+		   FROM paliad.deadline_rules_unified
 		  WHERE proceeding_type_id IN (?)
 		    AND is_active = true
 		  ORDER BY proceeding_type_id, sequence_order`, ids)
@@ -325,7 +327,7 @@ func (s *DeadlineRuleService) ListByConcept(ctx context.Context, conceptID uuid.
 	var rules []models.DeadlineRule
 	if err := s.db.SelectContext(ctx, &rules,
 		`SELECT `+ruleColumns+`
-		   FROM paliad.deadline_rules
+		   FROM paliad.deadline_rules_unified
 		  WHERE concept_id = $1
 		    AND is_active = true
 		  ORDER BY proceeding_type_id NULLS LAST, sequence_order`, conceptID); err != nil {

internal/services/deadline_service.go

@@ -272,7 +272,7 @@ func (s *DeadlineService) ListVisibleForUser(ctx context.Context, userID uuid.UU
 		       ar.requester_kind AS requester_kind
 		  FROM paliad.deadlines f
 		  JOIN paliad.projects p ON p.id = f.project_id
-		  LEFT JOIN paliad.deadline_rules r ON r.id = f.rule_id
+		  LEFT JOIN paliad.deadline_rules_unified r ON r.id = f.rule_id
 		  LEFT JOIN paliad.approval_requests ar ON ar.id = f.pending_request_id
 		 WHERE ` + strings.Join(conds, " AND ") + `
 		 ORDER BY f.due_date ASC, f.created_at DESC`
@@ -585,6 +585,16 @@ func (s *DeadlineService) Update(ctx context.Context, userID, deadlineID uuid.UU
 		if _, err := tx.ExecContext(ctx, query, args...); err != nil {
 			return nil, fmt.Errorf("update deadline: %w", err)
 		}
+		// Slice B.2 dual-write (t-paliad-305): if rule_id was in the
+		// patch (auto/custom swap from t-paliad-258), the parallel
+		// procedural_event_id + sequencing_rule_id columns must follow.
+		// Call unconditionally — it's a single UPDATE keyed on
+		// deadlineID and a no-op when rule_id is unchanged.
+		if input.RuleSet {
+			if err := syncDeadlineDualLinks(ctx, tx, deadlineID); err != nil {
+				return nil, err
+			}
+		}
 	}
 
 	if input.EventTypeIDs != nil && s.eventTypes != nil {

internal/services/dual_write.go

@@ -0,0 +1,392 @@
+// Slice B.2 dual-write (t-paliad-305 / m/paliad#93) — keep paliad's
+// new tables (procedural_events / sequencing_rules / legal_sources) in
+// lock-step with the legacy paliad.deadline_rules table during the
+// dual-write window. Mig 136 (Slice B.1) created the new tables and
+// backfilled them once. This file keeps them in sync going forward.
+//
+// Contract:
+//
+//   - Every RuleEditorService method that mutates paliad.deadline_rules
+//     calls syncDualWriteFromDeadlineRule(ctx, tx, id) inside the same
+//     transaction, AFTER the deadline_rules write, BEFORE tx.Commit.
+//   - The sync is idempotent (INSERT … ON CONFLICT … DO UPDATE) so the
+//     same call works for Create (new row), UpdateDraft (existing row),
+//     CloneAsDraft (new row referencing an old row), Publish (lifecycle
+//     flip), Archive/Restore (lifecycle flip), and the published-peer
+//     archive that Publish performs as a cascade.
+//   - The sync re-derives the new-table state from paliad.deadline_rules
+//     in pure SQL — no struct mapping in Go. The legacy table stays the
+//     source of truth during B.2 (B.3 flips reads, B.4 drops it).
+//   - Read paths still read deadline_rules in B.2. The new tables are a
+//     parallel projection kept consistent for B.3's read cutover; they
+//     are not yet authoritative.
+//
+// Why a per-row sync instead of a global trigger:
+//
+//   - The deadline_rules audit trigger (mig 079) reads paliad.audit_reason
+//     to record the rationale on every change. Putting the new-table
+//     write in the same TX preserves that auditability — set_config is
+//     transactional and the new writes share the same reason.
+//   - A Postgres-side AFTER UPDATE trigger on deadline_rules would also
+//     work but it's harder to test in isolation and harder to revert
+//     when B.4 drops the source table. A Go-side sync is reversible
+//     with a code revert; an SQL trigger needs a follow-up migration.
+//
+// The drift-check job (CheckDualWriteDrift below) runs daily and
+// alerts on mismatches. If the sync ever silently misses a row, the
+// drift check surfaces it inside one day.
+//
+// See docs/design-procedural-events-model-2026-05-25.md §5.2 (dual-write
+// phase) and docs/design-procedural-events-b0-findings-2026-05-26.md §7.
+package services
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+)
+
+// syncDualWriteFromDeadlineRule re-projects the deadline_rules row with
+// the given id into legal_sources + procedural_events + sequencing_rules.
+// Runs three UPSERT statements in the open transaction.
+//
+// Synthetic-code rule (for rows where deadline_rules.submission_code is
+// NULL) mirrors mig 136's backfill: 'null.' || first 8 hex chars of the
+// uuid (dashes stripped). This must stay byte-identical to the mig 136
+// expression or the lookup join inside the sequencing_rules UPSERT
+// misses.
+func syncDualWriteFromDeadlineRule(ctx context.Context, tx *sqlx.Tx, id uuid.UUID) error {
+	// 1. legal_sources — UPSERT the citation (no-op if already present).
+	//    jurisdiction is parsed from the first dot-separated segment;
+	//    'other' on empty (paranoid fallback, no live rows hit it).
+	if _, err := tx.ExecContext(ctx, `
+		INSERT INTO paliad.legal_sources (citation, jurisdiction)
+		SELECT dr.legal_source,
+		       COALESCE(NULLIF(split_part(dr.legal_source, '.', 1), ''), 'other')
+		  FROM paliad.deadline_rules dr
+		 WHERE dr.id = $1 AND dr.legal_source IS NOT NULL
+		ON CONFLICT (citation) DO NOTHING`, id); err != nil {
+		return fmt.Errorf("dual-write legal_sources for rule %s: %w", id, err)
+	}
+
+	// 2. procedural_events — UPSERT keyed by code. The code is the
+	//    submission_code if present, else the synthetic 'null.<8hex>'
+	//    minted from the deadline_rules row's id (matches mig 136).
+	//    legal_source_id is resolved by JOIN on legal_sources.citation
+	//    (NULL when the rule has no legal_source).
+	if _, err := tx.ExecContext(ctx, `
+		INSERT INTO paliad.procedural_events
+		    (code, name, name_en, description, event_kind,
+		     primary_party_default, legal_source_id, concept_id,
+		     lifecycle_state, published_at, is_active)
+		SELECT
+		    COALESCE(dr.submission_code,
+		             'null.' || substring(replace(dr.id::text, '-', ''), 1, 8)),
+		    dr.name, dr.name_en, dr.description, dr.event_type,
+		    dr.primary_party, ls.id, dr.concept_id,
+		    dr.lifecycle_state, dr.published_at, dr.is_active
+		  FROM paliad.deadline_rules dr
+		  LEFT JOIN paliad.legal_sources ls ON ls.citation = dr.legal_source
+		 WHERE dr.id = $1
+		ON CONFLICT (code) DO UPDATE SET
+		    name                  = EXCLUDED.name,
+		    name_en               = EXCLUDED.name_en,
+		    description           = EXCLUDED.description,
+		    event_kind            = EXCLUDED.event_kind,
+		    primary_party_default = EXCLUDED.primary_party_default,
+		    legal_source_id       = EXCLUDED.legal_source_id,
+		    concept_id            = EXCLUDED.concept_id,
+		    lifecycle_state       = EXCLUDED.lifecycle_state,
+		    published_at          = EXCLUDED.published_at,
+		    is_active             = EXCLUDED.is_active,
+		    updated_at            = now()`, id); err != nil {
+		return fmt.Errorf("dual-write procedural_events for rule %s: %w", id, err)
+	}
+
+	// 3. sequencing_rules — UPSERT keyed by id (1:1 inheritance from
+	//    deadline_rules.id). procedural_event_id resolved by JOIN on
+	//    the (real or synthetic) code. All hat-3 mechanics columns copy
+	//    1:1 from the deadline_rules row's post-write state.
+	if _, err := tx.ExecContext(ctx, `
+		INSERT INTO paliad.sequencing_rules
+		    (id, procedural_event_id, proceeding_type_id, parent_id, trigger_event_id,
+		     duration_value, duration_unit, timing,
+		     alt_duration_value, alt_duration_unit, alt_rule_code, anchor_alt,
+		     combine_op, condition_expr, primary_party, sequence_order,
+		     is_spawn, spawn_label, spawn_proceeding_type_id,
+		     is_bilateral, is_court_set, priority,
+		     rule_code, rule_codes, deadline_notes, deadline_notes_en,
+		     choices_offered, applies_to_target,
+		     lifecycle_state, draft_of, published_at, is_active,
+		     created_at, updated_at)
+		SELECT
+		    dr.id, pe.id,
+		    dr.proceeding_type_id, dr.parent_id, dr.trigger_event_id,
+		    dr.duration_value, dr.duration_unit, dr.timing,
+		    dr.alt_duration_value, dr.alt_duration_unit, dr.alt_rule_code, dr.anchor_alt,
+		    dr.combine_op, dr.condition_expr, dr.primary_party, dr.sequence_order,
+		    dr.is_spawn, dr.spawn_label, dr.spawn_proceeding_type_id,
+		    dr.is_bilateral, dr.is_court_set, dr.priority,
+		    dr.rule_code, dr.rule_codes, dr.deadline_notes, dr.deadline_notes_en,
+		    dr.choices_offered, dr.applies_to_target,
+		    dr.lifecycle_state, dr.draft_of, dr.published_at, dr.is_active,
+		    dr.created_at, dr.updated_at
+		  FROM paliad.deadline_rules dr
+		  JOIN paliad.procedural_events pe
+		    ON pe.code = COALESCE(dr.submission_code,
+		                          'null.' || substring(replace(dr.id::text, '-', ''), 1, 8))
+		 WHERE dr.id = $1
+		ON CONFLICT (id) DO UPDATE SET
+		    procedural_event_id      = EXCLUDED.procedural_event_id,
+		    proceeding_type_id       = EXCLUDED.proceeding_type_id,
+		    parent_id                = EXCLUDED.parent_id,
+		    trigger_event_id         = EXCLUDED.trigger_event_id,
+		    duration_value           = EXCLUDED.duration_value,
+		    duration_unit            = EXCLUDED.duration_unit,
+		    timing                   = EXCLUDED.timing,
+		    alt_duration_value       = EXCLUDED.alt_duration_value,
+		    alt_duration_unit        = EXCLUDED.alt_duration_unit,
+		    alt_rule_code            = EXCLUDED.alt_rule_code,
+		    anchor_alt               = EXCLUDED.anchor_alt,
+		    combine_op               = EXCLUDED.combine_op,
+		    condition_expr           = EXCLUDED.condition_expr,
+		    primary_party            = EXCLUDED.primary_party,
+		    sequence_order           = EXCLUDED.sequence_order,
+		    is_spawn                 = EXCLUDED.is_spawn,
+		    spawn_label              = EXCLUDED.spawn_label,
+		    spawn_proceeding_type_id = EXCLUDED.spawn_proceeding_type_id,
+		    is_bilateral             = EXCLUDED.is_bilateral,
+		    is_court_set             = EXCLUDED.is_court_set,
+		    priority                 = EXCLUDED.priority,
+		    rule_code                = EXCLUDED.rule_code,
+		    rule_codes               = EXCLUDED.rule_codes,
+		    deadline_notes           = EXCLUDED.deadline_notes,
+		    deadline_notes_en        = EXCLUDED.deadline_notes_en,
+		    choices_offered          = EXCLUDED.choices_offered,
+		    applies_to_target        = EXCLUDED.applies_to_target,
+		    lifecycle_state          = EXCLUDED.lifecycle_state,
+		    draft_of                 = EXCLUDED.draft_of,
+		    published_at             = EXCLUDED.published_at,
+		    is_active                = EXCLUDED.is_active,
+		    updated_at               = now()`, id); err != nil {
+		return fmt.Errorf("dual-write sequencing_rules for rule %s: %w", id, err)
+	}
+
+	return nil
+}
+
+// syncDeadlineDualLinks mirrors a deadline's legacy rule_id back-link
+// onto the new procedural_event_id + sequencing_rule_id columns added
+// by mig 136. Call this within an open transaction AFTER any UPDATE
+// that mutates paliad.deadlines.rule_id (mig 122 introduced rule_id
+// as the deadline→rule FK; today's writers are DeadlineService.Update
+// and RuleEditorService.ResolveOrphan).
+//
+// Idempotent: NULL rule_id collapses both new columns to NULL by virtue
+// of the subquery returning NULL. Slice B.2 (t-paliad-305).
+func syncDeadlineDualLinks(ctx context.Context, tx *sqlx.Tx, deadlineID uuid.UUID) error {
+	if _, err := tx.ExecContext(ctx, `
+		UPDATE paliad.deadlines d
+		   SET sequencing_rule_id  = d.rule_id,
+		       procedural_event_id = (
+		           SELECT sr.procedural_event_id
+		             FROM paliad.sequencing_rules sr
+		            WHERE sr.id = d.rule_id
+		       )
+		 WHERE d.id = $1`, deadlineID); err != nil {
+		return fmt.Errorf("sync deadline dual-links for %s: %w", deadlineID, err)
+	}
+	return nil
+}
+
+// DualWriteDriftReport summarises the comparison between the legacy
+// paliad.deadline_rules table and the new procedural_events /
+// sequencing_rules tables that B.2's dual-write is meant to keep in
+// sync. A zero-drift report (every count delta zero, every join clean)
+// is the steady state during the dual-write window; any non-zero field
+// is the signal that a write path either bypassed
+// syncDualWriteFromDeadlineRule or that an out-of-band mutation
+// happened (e.g. raw SQL run by an operator).
+type DualWriteDriftReport struct {
+	// Counts on the legacy and the projected side.
+	DeadlineRules    int `json:"deadline_rules"`
+	SequencingRules  int `json:"sequencing_rules"`
+	ProceduralEvents int `json:"procedural_events"`
+	LegalSources     int `json:"legal_sources"`
+
+	// Expected (from the legacy side) vs observed (on the new side).
+	ExpectedPE           int `json:"expected_procedural_events"`
+	ExpectedLegalSources int `json:"expected_legal_sources"`
+
+	// MissingSR — deadline_rules rows with no sequencing_rules row by id.
+	// OrphanedSR — sequencing_rules rows whose id doesn't exist in
+	// deadline_rules anymore (would only happen with a deletion path
+	// that bypasses dual-write).
+	MissingSR  int `json:"missing_sequencing_rules"`
+	OrphanedSR int `json:"orphaned_sequencing_rules"`
+
+	// MismatchedLifecycle — rows where deadline_rules.lifecycle_state
+	// disagrees with sequencing_rules.lifecycle_state. Should always be
+	// zero during dual-write.
+	MismatchedLifecycle int `json:"mismatched_lifecycle"`
+
+	// MismatchedActive — same shape, for is_active.
+	MismatchedActive int `json:"mismatched_active"`
+}
+
+// HasDrift returns true if any field signals divergence between the
+// legacy and projected sides. Used by the drift-check ticker to decide
+// whether to log at WARN (drift) or INFO (clean).
+func (r DualWriteDriftReport) HasDrift() bool {
+	if r.SequencingRules != r.DeadlineRules {
+		return true
+	}
+	if r.ProceduralEvents != r.ExpectedPE {
+		return true
+	}
+	if r.LegalSources != r.ExpectedLegalSources {
+		return true
+	}
+	if r.MissingSR != 0 || r.OrphanedSR != 0 {
+		return true
+	}
+	if r.MismatchedLifecycle != 0 || r.MismatchedActive != 0 {
+		return true
+	}
+	return false
+}
+
+// CheckDualWriteDrift compares the legacy paliad.deadline_rules table
+// against the parallel new tables maintained by Slice B.2's dual-write.
+// Returns a DualWriteDriftReport — caller decides what to do with
+// non-zero drift (log, page, fail healthcheck, etc.).
+//
+// Read-only. Safe to run against prod. Single query per metric so the
+// pool isn't held for a long time. No locks; tolerates concurrent
+// writes (counts may shift by one or two during the read, but a
+// persistent drift > 0 is the alarm signal).
+func CheckDualWriteDrift(ctx context.Context, conn *sqlx.DB) (*DualWriteDriftReport, error) {
+	var r DualWriteDriftReport
+
+	q := func(label, sql string, dst *int) error {
+		if err := conn.GetContext(ctx, dst, sql); err != nil {
+			return fmt.Errorf("drift-check %s: %w", label, err)
+		}
+		return nil
+	}
+
+	if err := q("dr_total", `SELECT COUNT(*) FROM paliad.deadline_rules`, &r.DeadlineRules); err != nil {
+		return nil, err
+	}
+	if err := q("sr_total", `SELECT COUNT(*) FROM paliad.sequencing_rules`, &r.SequencingRules); err != nil {
+		return nil, err
+	}
+	if err := q("pe_total", `SELECT COUNT(*) FROM paliad.procedural_events`, &r.ProceduralEvents); err != nil {
+		return nil, err
+	}
+	if err := q("ls_total", `SELECT COUNT(*) FROM paliad.legal_sources`, &r.LegalSources); err != nil {
+		return nil, err
+	}
+
+	if err := q("expected_pe", `
+		SELECT
+		  (SELECT COUNT(DISTINCT submission_code) FROM paliad.deadline_rules WHERE submission_code IS NOT NULL)
+		  +
+		  (SELECT COUNT(*) FROM paliad.deadline_rules WHERE submission_code IS NULL)
+	`, &r.ExpectedPE); err != nil {
+		return nil, err
+	}
+	if err := q("expected_ls",
+		`SELECT COUNT(DISTINCT legal_source) FROM paliad.deadline_rules WHERE legal_source IS NOT NULL`,
+		&r.ExpectedLegalSources); err != nil {
+		return nil, err
+	}
+
+	if err := q("missing_sr", `
+		SELECT COUNT(*) FROM paliad.deadline_rules dr
+		  LEFT JOIN paliad.sequencing_rules sr ON sr.id = dr.id
+		 WHERE sr.id IS NULL`, &r.MissingSR); err != nil {
+		return nil, err
+	}
+	if err := q("orphaned_sr", `
+		SELECT COUNT(*) FROM paliad.sequencing_rules sr
+		  LEFT JOIN paliad.deadline_rules dr ON dr.id = sr.id
+		 WHERE dr.id IS NULL`, &r.OrphanedSR); err != nil {
+		return nil, err
+	}
+
+	if err := q("mismatched_lifecycle", `
+		SELECT COUNT(*) FROM paliad.deadline_rules dr
+		  JOIN paliad.sequencing_rules sr ON sr.id = dr.id
+		 WHERE dr.lifecycle_state <> sr.lifecycle_state`, &r.MismatchedLifecycle); err != nil {
+		return nil, err
+	}
+	if err := q("mismatched_active", `
+		SELECT COUNT(*) FROM paliad.deadline_rules dr
+		  JOIN paliad.sequencing_rules sr ON sr.id = dr.id
+		 WHERE dr.is_active <> sr.is_active`, &r.MismatchedActive); err != nil {
+		return nil, err
+	}
+
+	return &r, nil
+}
+
+// StartDualWriteDriftCheckLoop runs CheckDualWriteDrift on a fixed
+// interval for the lifetime of ctx. A clean run logs at INFO level;
+// drift logs at WARN level with the full report payload. The first
+// check fires after `interval`, not immediately on Start — by the time
+// the ticker first fires the process has finished booting and the
+// initial backfill + dual-write writes have settled.
+//
+// Slice B.2 (t-paliad-305). interval should be short enough to surface
+// drift before the next deploy (so a broken dual-write doesn't sit
+// silent for a week) and long enough to avoid noise (the check holds
+// no locks but it does run nine SELECT COUNTs).
+//
+// Recommended interval: 6h. Override via the caller (cmd/server picks
+// the runtime value).
+func StartDualWriteDriftCheckLoop(ctx context.Context, conn *sqlx.DB, interval time.Duration) {
+	if interval <= 0 {
+		interval = 6 * time.Hour
+	}
+	go func() {
+		t := time.NewTicker(interval)
+		defer t.Stop()
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-t.C:
+				report, err := CheckDualWriteDrift(ctx, conn)
+				if err != nil {
+					log.Printf("dual-write drift-check: error: %v", err)
+					continue
+				}
+				if report.HasDrift() {
+					log.Printf("dual-write drift-check: DRIFT DETECTED — "+
+						"deadline_rules=%d sequencing_rules=%d "+
+						"procedural_events=%d (expected %d) "+
+						"legal_sources=%d (expected %d) "+
+						"missing_sr=%d orphaned_sr=%d "+
+						"mismatched_lifecycle=%d mismatched_active=%d",
+						report.DeadlineRules, report.SequencingRules,
+						report.ProceduralEvents, report.ExpectedPE,
+						report.LegalSources, report.ExpectedLegalSources,
+						report.MissingSR, report.OrphanedSR,
+						report.MismatchedLifecycle, report.MismatchedActive)
+				} else {
+					log.Printf("dual-write drift-check: OK — "+
+						"deadline_rules=%d sequencing_rules=%d "+
+						"procedural_events=%d legal_sources=%d",
+						report.DeadlineRules, report.SequencingRules,
+						report.ProceduralEvents, report.LegalSources)
+				}
+			}
+		}
+	}()
+}
+

internal/services/dual_write_test.go

@@ -0,0 +1,300 @@
+// Slice B.2 dual-write tests (t-paliad-305 / m/paliad#93).
+//
+// Asserts the parallel projection — paliad.procedural_events +
+// paliad.sequencing_rules + paliad.legal_sources — stays in lock-step
+// with paliad.deadline_rules through the full RuleEditorService
+// lifecycle. Skipped when TEST_DATABASE_URL is unset.
+
+package services
+
+import (
+	"context"
+	"os"
+	"testing"
+
+	"github.com/jmoiron/sqlx"
+	_ "github.com/lib/pq"
+
+	"mgit.msbls.de/m/paliad/internal/db"
+)
+
+// TestDualWrite_RuleEditorLifecycle walks Create → UpdateDraft →
+// CloneAsDraft → Publish → Archive → Restore on RuleEditorService and
+// after each operation asserts that paliad.sequencing_rules has the
+// 1:1 mirror, paliad.procedural_events carries the projected identity,
+// and paliad.legal_sources carries the citation.
+func TestDualWrite_RuleEditorLifecycle(t *testing.T) {
+	url := os.Getenv("TEST_DATABASE_URL")
+	if url == "" {
+		t.Skip("TEST_DATABASE_URL not set — skipping live DB test")
+	}
+	if err := db.ApplyMigrations(url); err != nil {
+		t.Fatalf("apply migrations: %v", err)
+	}
+	pool, err := sqlx.Connect("postgres", url)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	defer pool.Close()
+
+	ctx := context.Background()
+	rules := NewDeadlineRuleService(pool)
+	svc := NewRuleEditorService(pool, rules)
+
+	cleanup := func() {
+		pool.ExecContext(ctx,
+			`SELECT set_config('paliad.audit_reason', 'slice b.2 test cleanup', true)`)
+		// Order matters: sequencing_rules → procedural_events → legal_sources
+		// (FK direction). deadline_rules cleanup last because mig 079 audit
+		// trigger captures the DELETE.
+		pool.ExecContext(ctx, `DELETE FROM paliad.sequencing_rules WHERE id IN (
+			SELECT id FROM paliad.deadline_rules WHERE name LIKE 'SLICEB2_TEST_%'
+		)`)
+		pool.ExecContext(ctx, `DELETE FROM paliad.procedural_events
+			WHERE code LIKE 'sliceb2.%' OR code LIKE 'null.sliceb2%'`)
+		pool.ExecContext(ctx, `DELETE FROM paliad.legal_sources
+			WHERE citation LIKE 'SLICEB2.%'`)
+		pool.ExecContext(ctx,
+			`DELETE FROM paliad.deadline_rules WHERE name LIKE 'SLICEB2_TEST_%'`)
+		pool.ExecContext(ctx,
+			`DELETE FROM paliad.proceeding_types WHERE code = 'SLICEB2_TEST_PT'`)
+	}
+	cleanup()
+	defer cleanup()
+
+	var ptID int
+	if err := pool.GetContext(ctx, &ptID, `
+		INSERT INTO paliad.proceeding_types (code, name, name_en, category, jurisdiction, is_active)
+		VALUES ('SLICEB2_TEST_PT', 'Slice B.2 Test PT', 'Slice B.2 Test PT', 'fristenrechner', 'UPC', true)
+		RETURNING id`); err != nil {
+		t.Fatalf("seed proceeding_type: %v", err)
+	}
+
+	subCode := "sliceb2.create"
+	legalSrc := "SLICEB2.PatG.1"
+
+	// 1. Create — assert the parallel rows land.
+	created, err := svc.Create(ctx, CreateRuleInput{
+		Name:             "SLICEB2_TEST_create",
+		NameEN:           "SLICEB2_TEST_create_EN",
+		ProceedingTypeID: &ptID,
+		SubmissionCode:   &subCode,
+		LegalSource:      &legalSrc,
+		DurationValue:    30,
+		DurationUnit:     "days",
+		Priority:         "mandatory",
+	}, "B.2 dual-write create test")
+	if err != nil {
+		t.Fatalf("Create: %v", err)
+	}
+
+	// legal_sources should now carry SLICEB2.PatG.1
+	var lsCount int
+	if err := pool.GetContext(ctx, &lsCount,
+		`SELECT COUNT(*) FROM paliad.legal_sources WHERE citation = $1`, legalSrc); err != nil {
+		t.Fatalf("query legal_sources: %v", err)
+	}
+	if lsCount != 1 {
+		t.Errorf("legal_sources after Create: got %d, want 1 for citation %q", lsCount, legalSrc)
+	}
+
+	// procedural_events should carry the submission_code
+	var peName, peLifecycle string
+	if err := pool.GetContext(ctx, &peName,
+		`SELECT name FROM paliad.procedural_events WHERE code = $1`, subCode); err != nil {
+		t.Fatalf("query procedural_events name: %v", err)
+	}
+	if peName != "SLICEB2_TEST_create" {
+		t.Errorf("procedural_events.name after Create: got %q, want %q", peName, "SLICEB2_TEST_create")
+	}
+	if err := pool.GetContext(ctx, &peLifecycle,
+		`SELECT lifecycle_state FROM paliad.procedural_events WHERE code = $1`, subCode); err != nil {
+		t.Fatalf("query procedural_events lifecycle: %v", err)
+	}
+	if peLifecycle != "draft" {
+		t.Errorf("procedural_events.lifecycle_state after Create: got %q, want %q", peLifecycle, "draft")
+	}
+
+	// sequencing_rules should have id = created.id and link to PE
+	var srCount, srMatchPE int
+	if err := pool.GetContext(ctx, &srCount,
+		`SELECT COUNT(*) FROM paliad.sequencing_rules WHERE id = $1`, created.ID); err != nil {
+		t.Fatalf("query sequencing_rules count: %v", err)
+	}
+	if srCount != 1 {
+		t.Errorf("sequencing_rules row after Create: got %d, want 1 for id %s", srCount, created.ID)
+	}
+	if err := pool.GetContext(ctx, &srMatchPE, `
+		SELECT COUNT(*) FROM paliad.sequencing_rules sr
+		  JOIN paliad.procedural_events pe ON pe.id = sr.procedural_event_id
+		 WHERE sr.id = $1 AND pe.code = $2`, created.ID, subCode); err != nil {
+		t.Fatalf("query sr→pe join: %v", err)
+	}
+	if srMatchPE != 1 {
+		t.Errorf("sequencing_rules.procedural_event_id after Create: got %d join hits, want 1", srMatchPE)
+	}
+
+	// 2. UpdateDraft — change name + legal_source. Assert propagation.
+	newName := "SLICEB2_TEST_updated"
+	newLegal := "SLICEB2.ZPO.2"
+	_, err = svc.UpdateDraft(ctx, created.ID, RulePatch{
+		Name:        &newName,
+		LegalSource: &newLegal,
+	}, "B.2 dual-write update test")
+	if err != nil {
+		t.Fatalf("UpdateDraft: %v", err)
+	}
+
+	var afterName string
+	if err := pool.GetContext(ctx, &afterName,
+		`SELECT name FROM paliad.procedural_events WHERE code = $1`, subCode); err != nil {
+		t.Fatalf("query pe.name post-update: %v", err)
+	}
+	if afterName != newName {
+		t.Errorf("procedural_events.name after UpdateDraft: got %q, want %q", afterName, newName)
+	}
+
+	// New citation must appear in legal_sources, and procedural_events.legal_source_id
+	// must point at it (idempotent UPSERT — the old SLICEB2.PatG.1 row stays).
+	var pePointsAtNewLegal int
+	if err := pool.GetContext(ctx, &pePointsAtNewLegal, `
+		SELECT COUNT(*) FROM paliad.procedural_events pe
+		  JOIN paliad.legal_sources ls ON ls.id = pe.legal_source_id
+		 WHERE pe.code = $1 AND ls.citation = $2`, subCode, newLegal); err != nil {
+		t.Fatalf("query pe→ls join: %v", err)
+	}
+	if pePointsAtNewLegal != 1 {
+		t.Errorf("procedural_events.legal_source_id after UpdateDraft: got %d hits, want 1", pePointsAtNewLegal)
+	}
+
+	// 3. Publish — flip to published. Assert lifecycle mirror.
+	_, err = svc.Publish(ctx, created.ID, "B.2 dual-write publish test")
+	if err != nil {
+		t.Fatalf("Publish: %v", err)
+	}
+	var srLifecycle, peLifecycleAfterPub string
+	if err := pool.GetContext(ctx, &srLifecycle,
+		`SELECT lifecycle_state FROM paliad.sequencing_rules WHERE id = $1`, created.ID); err != nil {
+		t.Fatalf("query sr.lifecycle: %v", err)
+	}
+	if srLifecycle != "published" {
+		t.Errorf("sequencing_rules.lifecycle_state after Publish: got %q, want %q", srLifecycle, "published")
+	}
+	if err := pool.GetContext(ctx, &peLifecycleAfterPub,
+		`SELECT lifecycle_state FROM paliad.procedural_events WHERE code = $1`, subCode); err != nil {
+		t.Fatalf("query pe.lifecycle post-publish: %v", err)
+	}
+	if peLifecycleAfterPub != "published" {
+		t.Errorf("procedural_events.lifecycle_state after Publish: got %q, want %q", peLifecycleAfterPub, "published")
+	}
+
+	// 4. Archive — flip to archived. Assert mirror.
+	_, err = svc.Archive(ctx, created.ID, "B.2 dual-write archive test")
+	if err != nil {
+		t.Fatalf("Archive: %v", err)
+	}
+	var srLifecycleArchived string
+	if err := pool.GetContext(ctx, &srLifecycleArchived,
+		`SELECT lifecycle_state FROM paliad.sequencing_rules WHERE id = $1`, created.ID); err != nil {
+		t.Fatalf("query sr.lifecycle post-archive: %v", err)
+	}
+	if srLifecycleArchived != "archived" {
+		t.Errorf("sequencing_rules.lifecycle_state after Archive: got %q, want %q", srLifecycleArchived, "archived")
+	}
+
+	// 5. Drift check should return zero drift right after the dance.
+	report, err := CheckDualWriteDrift(ctx, pool)
+	if err != nil {
+		t.Fatalf("CheckDualWriteDrift: %v", err)
+	}
+	if report.HasDrift() {
+		t.Errorf("CheckDualWriteDrift unexpectedly flagged drift: %+v", report)
+	}
+}
+
+// TestDualWrite_SyntheticCodeForNullSubmission asserts that a rule
+// created with submission_code=NULL gets a synthetic 'null.<8hex>'
+// procedural_events row matching mig 136's mint expression — so a new
+// draft without a code participates in the dual-write contract without
+// colliding with any code-bearing rule.
+func TestDualWrite_SyntheticCodeForNullSubmission(t *testing.T) {
+	url := os.Getenv("TEST_DATABASE_URL")
+	if url == "" {
+		t.Skip("TEST_DATABASE_URL not set — skipping live DB test")
+	}
+	if err := db.ApplyMigrations(url); err != nil {
+		t.Fatalf("apply migrations: %v", err)
+	}
+	pool, err := sqlx.Connect("postgres", url)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	defer pool.Close()
+
+	ctx := context.Background()
+	rules := NewDeadlineRuleService(pool)
+	svc := NewRuleEditorService(pool, rules)
+
+	cleanup := func() {
+		pool.ExecContext(ctx, `SELECT set_config('paliad.audit_reason', 'slice b.2 null-code cleanup', true)`)
+		pool.ExecContext(ctx, `DELETE FROM paliad.sequencing_rules WHERE id IN (
+			SELECT id FROM paliad.deadline_rules WHERE name = 'SLICEB2_TEST_nullcode'
+		)`)
+		// Synthetic PE rows are keyed off the rule's uuid; delete by name reference.
+		pool.ExecContext(ctx, `DELETE FROM paliad.procedural_events
+			WHERE code IN (
+			  SELECT 'null.' || substring(replace(id::text, '-', ''), 1, 8)
+			    FROM paliad.deadline_rules WHERE name = 'SLICEB2_TEST_nullcode'
+			)`)
+		pool.ExecContext(ctx, `DELETE FROM paliad.deadline_rules WHERE name = 'SLICEB2_TEST_nullcode'`)
+		pool.ExecContext(ctx, `DELETE FROM paliad.proceeding_types WHERE code = 'SLICEB2_NC_PT'`)
+	}
+	cleanup()
+	defer cleanup()
+
+	var ptID int
+	if err := pool.GetContext(ctx, &ptID, `
+		INSERT INTO paliad.proceeding_types (code, name, name_en, category, jurisdiction, is_active)
+		VALUES ('SLICEB2_NC_PT', 'NC PT', 'NC PT', 'fristenrechner', 'UPC', true)
+		RETURNING id`); err != nil {
+		t.Fatalf("seed proceeding_type: %v", err)
+	}
+
+	created, err := svc.Create(ctx, CreateRuleInput{
+		Name:             "SLICEB2_TEST_nullcode",
+		NameEN:           "SLICEB2_TEST_nullcode_EN",
+		ProceedingTypeID: &ptID,
+		// SubmissionCode intentionally NIL → tests the synthetic-code branch.
+		DurationValue: 5,
+		DurationUnit:  "days",
+		Priority:      "mandatory",
+	}, "B.2 dual-write null-code test")
+	if err != nil {
+		t.Fatalf("Create: %v", err)
+	}
+
+	// Compute the expected synthetic code in the same way mig 136 / the
+	// dual-write helper do — keep the expression in lock-step with the
+	// SQL via this Go-side mirror.
+	var expectedCode string
+	if err := pool.GetContext(ctx, &expectedCode,
+		`SELECT 'null.' || substring(replace(id::text, '-', ''), 1, 8)
+		   FROM paliad.deadline_rules WHERE id = $1`, created.ID); err != nil {
+		t.Fatalf("compute expected synthetic code: %v", err)
+	}
+
+	var actualCode string
+	if err := pool.GetContext(ctx, &actualCode, `
+		SELECT pe.code
+		  FROM paliad.procedural_events pe
+		  JOIN paliad.sequencing_rules sr ON sr.procedural_event_id = pe.id
+		 WHERE sr.id = $1`, created.ID); err != nil {
+		t.Fatalf("query procedural_events via sequencing_rules: %v", err)
+	}
+	if actualCode != expectedCode {
+		t.Errorf("synthetic code mismatch: got %q, want %q", actualCode, expectedCode)
+	}
+	if len(actualCode) != len("null.")+8 {
+		t.Errorf("synthetic code length: got %d, want 13 (null.+8hex)", len(actualCode))
+	}
+}

internal/services/event_deadline_service.go

@@ -168,7 +168,7 @@ func (s *EventDeadlineService) Calculate(ctx context.Context, triggerEventID int
 		       COALESCE(timing, 'after') AS timing,
 		       deadline_notes, deadline_notes_en, alt_duration_value, alt_duration_unit,
 		       combine_op, rule_codes
-		  FROM paliad.deadline_rules
+		  FROM paliad.deadline_rules_unified
 		 WHERE trigger_event_id = $1 AND is_active = true
 		 ORDER BY sequence_order`, triggerEventID)
 	if err != nil {

internal/services/export_service.go

@@ -46,6 +46,7 @@ import (
 	"encoding/csv"
 	"fmt"
 	"io"
+	"log/slog"
 	"regexp"
 	"sort"
 	"strings"
@@ -297,7 +298,10 @@ func (s *ExportService) WriteOrg(ctx context.Context, w io.Writer, spec ExportSp
 	// is just bookkeeping that releases the snapshot.
 	defer func() { _ = tx.Rollback() }()
 
-	sheets := orgSheetQueries()
+	sheets, err := resolveOrgSheets(ctx, tx, orgSheetSpecs())
+	if err != nil {
+		return meta, err
+	}
 	if err := s.writeBundle(ctx, tx, w, sheets, &meta); err != nil {
 		return meta, err
 	}
@@ -1138,7 +1142,7 @@ func personalSheetQueries(actorID uuid.UUID) []sheetQuery {
 		},
 		{
 			SheetName: "ref__deadline_rules",
-			SQL:       `SELECT * FROM paliad.deadline_rules ORDER BY id`,
+			SQL:       `SELECT * FROM paliad.deadline_rules_unified ORDER BY id`,
 		},
 		{
 			SheetName: "ref__deadline_concepts",
@@ -1518,7 +1522,7 @@ SELECT 'partner_unit_default'::text AS source,
 		{SheetName: "ref__proceeding_types", SQL: `SELECT * FROM paliad.proceeding_types ORDER BY id`},
 		{SheetName: "ref__event_types", SQL: `SELECT * FROM paliad.event_types ORDER BY id`},
 		{SheetName: "ref__event_categories", SQL: `SELECT * FROM paliad.event_categories ORDER BY id`},
-		{SheetName: "ref__deadline_rules", SQL: `SELECT * FROM paliad.deadline_rules ORDER BY id`},
+		{SheetName: "ref__deadline_rules", SQL: `SELECT * FROM paliad.deadline_rules_unified ORDER BY id`},
 		{SheetName: "ref__deadline_concepts", SQL: `SELECT * FROM paliad.deadline_concepts ORDER BY id`},
 		{SheetName: "ref__courts", SQL: `SELECT * FROM paliad.courts ORDER BY id`},
 		{SheetName: "ref__countries", SQL: `SELECT * FROM paliad.countries ORDER BY code`},
@@ -1560,73 +1564,249 @@ SELECT 'partner_unit_default'::text AS source,
 // secret|token|password|api_key|private_key on every sheet as a
 // belt-and-braces filter. user_caldav_config.password_encrypted is
 // explicitly named in DropColumns too.
-func orgSheetQueries() []sheetQuery {
-	return []sheetQuery{
+//
+// Drift-resistance (m/paliad#140): each spec declares its desired
+// ORDER BY columns as a list. At backup time the exporter probes
+// information_schema.columns for the live schema; any ORDER BY column
+// that no longer exists is dropped (logged WARN). This way a column
+// rename or removal never breaks a backup — the worst case is a sheet
+// that loses sort stability until the spec is updated. A sheet whose
+// ORDER BY columns are all gone still exports, just in pg's natural
+// (unspecified) order.
+//
+// Custom column projections (e.g. documents drops ai_extracted) live
+// in the SQL override field; if set, it bypasses the Table+OrderBy
+// builder entirely. Use it sparingly — every override re-introduces
+// drift risk for that sheet.
+
+// orgSheetSpec declares one org-scope sheet for the drift-resistant
+// builder. Either set SQL (free-form override) or set Table+OrderBy
+// (let the builder compose `SELECT * FROM <Table> ORDER BY <existing>`).
+type orgSheetSpec struct {
+	// SheetName lands in the workbook sheet and the JSON top-level key.
+	SheetName string
+	// Table is schema-qualified (e.g. "paliad.appointments"). Used only
+	// when SQL is empty. The schema/table form must be valid SQL
+	// identifiers — the builder splits on the dot, no quoting.
+	Table string
+	// OrderBy is the *desired* sort columns. Missing columns are
+	// dropped silently-with-a-WARN at build time; remaining columns
+	// keep their declared order. Empty/all-missing → no ORDER BY (still
+	// deterministic-within-a-snapshot under the REPEATABLE READ tx, but
+	// the order across runs may differ).
+	OrderBy []string
+	// SQL is an explicit override; if non-empty, Table+OrderBy are
+	// ignored entirely. Use only when the projection cannot be
+	// expressed as SELECT * (e.g. documents drops the ai_extracted
+	// jsonb column).
+	SQL string
+	// Args are positional arguments. Only meaningful with SQL override;
+	// the Table+OrderBy path takes no args.
+	Args []any
+	// DropColumns is an explicit list of column names to drop from the
+	// result regardless of the PII deny-regex.
+	DropColumns []string
+}
+
+func orgSheetSpecs() []orgSheetSpec {
+	return []orgSheetSpec{
 		// --- entity sheets (alphabetical) ---
-		{SheetName: "appointment_caldav_targets", SQL: `SELECT * FROM paliad.appointment_caldav_targets ORDER BY appointment_id, calendar_binding_id`},
-		{SheetName: "appointments", SQL: `SELECT * FROM paliad.appointments ORDER BY id`},
-		{SheetName: "approval_policies", SQL: `SELECT * FROM paliad.approval_policies ORDER BY id`},
-		{SheetName: "approval_requests", SQL: `SELECT * FROM paliad.approval_requests ORDER BY id`},
+		{SheetName: "appointment_caldav_targets", Table: "paliad.appointment_caldav_targets", OrderBy: []string{"appointment_id", "binding_id"}},
+		{SheetName: "appointments", Table: "paliad.appointments", OrderBy: []string{"id"}},
+		{SheetName: "approval_policies", Table: "paliad.approval_policies", OrderBy: []string{"id"}},
+		{SheetName: "approval_requests", Table: "paliad.approval_requests", OrderBy: []string{"id"}},
 		// backups is self-reflexive — including it makes "what backups
 		// have we taken" recoverable from any prior backup. Tiny table.
-		{SheetName: "backups", SQL: `SELECT * FROM paliad.backups ORDER BY started_at, id`},
-		{SheetName: "caldav_sync_log", SQL: `SELECT * FROM paliad.caldav_sync_log ORDER BY occurred_at, id`},
-		{SheetName: "checklist_instances", SQL: `SELECT * FROM paliad.checklist_instances ORDER BY id`},
-		{SheetName: "checklist_shares", SQL: `SELECT * FROM paliad.checklist_shares ORDER BY id`},
-		{SheetName: "checklists", SQL: `SELECT * FROM paliad.checklists ORDER BY id`},
-		{SheetName: "deadline_rule_audit", SQL: `SELECT * FROM paliad.deadline_rule_audit ORDER BY changed_at, id`},
-		{SheetName: "deadlines", SQL: `SELECT * FROM paliad.deadlines ORDER BY id`},
+		{SheetName: "backups", Table: "paliad.backups", OrderBy: []string{"started_at", "id"}},
+		{SheetName: "caldav_sync_log", Table: "paliad.caldav_sync_log", OrderBy: []string{"occurred_at", "id"}},
+		{SheetName: "checklist_instances", Table: "paliad.checklist_instances", OrderBy: []string{"id"}},
+		{SheetName: "checklist_shares", Table: "paliad.checklist_shares", OrderBy: []string{"id"}},
+		{SheetName: "checklists", Table: "paliad.checklists", OrderBy: []string{"id"}},
+		{SheetName: "deadline_rule_audit", Table: "paliad.deadline_rule_audit", OrderBy: []string{"changed_at", "id"}},
+		{SheetName: "deadlines", Table: "paliad.deadlines", OrderBy: []string{"id"}},
 		// documents: ai_extracted jsonb dropped (verbose AI prompts;
 		// matches the personal/project precedent). Binaries are not in
-		// the export — only metadata.
+		// the export — only metadata. Uses SQL override because the
+		// projection isn't SELECT *.
 		{
 			SheetName: "documents",
 			SQL: `SELECT id, project_id, title, doc_type, file_path, file_size, mime_type, uploaded_by, created_at, updated_at
 				    FROM paliad.documents
 				ORDER BY id`,
 		},
-		{SheetName: "email_broadcasts", SQL: `SELECT * FROM paliad.email_broadcasts ORDER BY id`},
-		{SheetName: "email_template_versions", SQL: `SELECT * FROM paliad.email_template_versions ORDER BY id`},
-		{SheetName: "email_templates", SQL: `SELECT * FROM paliad.email_templates ORDER BY id`},
-		{SheetName: "firm_dashboard_default", SQL: `SELECT * FROM paliad.firm_dashboard_default ORDER BY id`},
-		{SheetName: "invitations", SQL: `SELECT * FROM paliad.invitations ORDER BY sent_at, id`},
-		{SheetName: "notes", SQL: `SELECT * FROM paliad.notes ORDER BY id`},
-		{SheetName: "parties", SQL: `SELECT * FROM paliad.parties ORDER BY id`},
-		{SheetName: "partner_unit_events", SQL: `SELECT * FROM paliad.partner_unit_events ORDER BY id`},
-		{SheetName: "partner_unit_members", SQL: `SELECT * FROM paliad.partner_unit_members ORDER BY partner_unit_id, user_id`},
-		{SheetName: "partner_units", SQL: `SELECT * FROM paliad.partner_units ORDER BY id`},
-		{SheetName: "policy_audit_log", SQL: `SELECT * FROM paliad.policy_audit_log ORDER BY changed_at, id`},
-		{SheetName: "project_events", SQL: `SELECT * FROM paliad.project_events ORDER BY id`},
-		{SheetName: "project_partner_units", SQL: `SELECT * FROM paliad.project_partner_units ORDER BY project_id, partner_unit_id`},
-		{SheetName: "project_teams", SQL: `SELECT * FROM paliad.project_teams ORDER BY project_id, user_id`},
-		{SheetName: "projects", SQL: `SELECT * FROM paliad.projects ORDER BY id`},
-		{SheetName: "reminder_log", SQL: `SELECT * FROM paliad.reminder_log ORDER BY sent_at, id`},
-		{SheetName: "submission_drafts", SQL: `SELECT * FROM paliad.submission_drafts ORDER BY id`},
-		{SheetName: "system_audit_log", SQL: `SELECT * FROM paliad.system_audit_log ORDER BY created_at, id`},
+		{SheetName: "email_broadcasts", Table: "paliad.email_broadcasts", OrderBy: []string{"id"}},
+		{SheetName: "email_template_versions", Table: "paliad.email_template_versions", OrderBy: []string{"id"}},
+		{SheetName: "email_templates", Table: "paliad.email_templates", OrderBy: []string{"key", "lang"}},
+		{SheetName: "firm_dashboard_default", Table: "paliad.firm_dashboard_default", OrderBy: []string{"id"}},
+		{SheetName: "invitations", Table: "paliad.invitations", OrderBy: []string{"sent_at", "id"}},
+		{SheetName: "notes", Table: "paliad.notes", OrderBy: []string{"id"}},
+		{SheetName: "parties", Table: "paliad.parties", OrderBy: []string{"id"}},
+		{SheetName: "partner_unit_events", Table: "paliad.partner_unit_events", OrderBy: []string{"id"}},
+		{SheetName: "partner_unit_members", Table: "paliad.partner_unit_members", OrderBy: []string{"partner_unit_id", "user_id"}},
+		{SheetName: "partner_units", Table: "paliad.partner_units", OrderBy: []string{"id"}},
+		{SheetName: "policy_audit_log", Table: "paliad.policy_audit_log", OrderBy: []string{"created_at", "id"}},
+		{SheetName: "project_events", Table: "paliad.project_events", OrderBy: []string{"id"}},
+		{SheetName: "project_partner_units", Table: "paliad.project_partner_units", OrderBy: []string{"project_id", "partner_unit_id"}},
+		{SheetName: "project_teams", Table: "paliad.project_teams", OrderBy: []string{"project_id", "user_id"}},
+		{SheetName: "projects", Table: "paliad.projects", OrderBy: []string{"id"}},
+		{SheetName: "reminder_log", Table: "paliad.reminder_log", OrderBy: []string{"sent_at", "id"}},
+		{SheetName: "submission_drafts", Table: "paliad.submission_drafts", OrderBy: []string{"id"}},
+		{SheetName: "system_audit_log", Table: "paliad.system_audit_log", OrderBy: []string{"created_at", "id"}},
 		{
 			SheetName:   "user_caldav_config",
-			SQL:         `SELECT * FROM paliad.user_caldav_config ORDER BY user_id`,
+			Table:       "paliad.user_caldav_config",
+			OrderBy:     []string{"user_id"},
 			DropColumns: []string{"password_encrypted"}, // belt-and-braces; piiColumnDenyRegex also catches it
 		},
-		{SheetName: "user_calendar_bindings", SQL: `SELECT * FROM paliad.user_calendar_bindings ORDER BY user_id, calendar_path`},
-		{SheetName: "user_card_layouts", SQL: `SELECT * FROM paliad.user_card_layouts ORDER BY id`},
-		{SheetName: "user_dashboard_layouts", SQL: `SELECT * FROM paliad.user_dashboard_layouts ORDER BY user_id`},
-		{SheetName: "user_pinned_projects", SQL: `SELECT * FROM paliad.user_pinned_projects ORDER BY user_id, project_id`},
-		{SheetName: "user_views", SQL: `SELECT * FROM paliad.user_views ORDER BY id`},
-		{SheetName: "users", SQL: `SELECT * FROM paliad.users ORDER BY id`},
+		{SheetName: "user_calendar_bindings", Table: "paliad.user_calendar_bindings", OrderBy: []string{"user_id", "calendar_path"}},
+		{SheetName: "user_card_layouts", Table: "paliad.user_card_layouts", OrderBy: []string{"id"}},
+		{SheetName: "user_dashboard_layouts", Table: "paliad.user_dashboard_layouts", OrderBy: []string{"user_id"}},
+		{SheetName: "user_pinned_projects", Table: "paliad.user_pinned_projects", OrderBy: []string{"user_id", "project_id"}},
+		{SheetName: "user_views", Table: "paliad.user_views", OrderBy: []string{"id"}},
+		{SheetName: "users", Table: "paliad.users", OrderBy: []string{"id"}},
 
 		// --- reference data (alphabetical, prefixed ref__) ---
-		{SheetName: "ref__countries", SQL: `SELECT * FROM paliad.countries ORDER BY code`},
-		{SheetName: "ref__courts", SQL: `SELECT * FROM paliad.courts ORDER BY id`},
-		{SheetName: "ref__deadline_concept_event_types", SQL: `SELECT * FROM paliad.deadline_concept_event_types ORDER BY concept_id, event_type_id`},
-		{SheetName: "ref__deadline_concepts", SQL: `SELECT * FROM paliad.deadline_concepts ORDER BY id`},
-		{SheetName: "ref__deadline_event_types", SQL: `SELECT * FROM paliad.deadline_event_types ORDER BY rule_id, event_type_id`},
-		{SheetName: "ref__deadline_rules", SQL: `SELECT * FROM paliad.deadline_rules ORDER BY id`},
-		{SheetName: "ref__event_categories", SQL: `SELECT * FROM paliad.event_categories ORDER BY id`},
-		{SheetName: "ref__event_category_concepts", SQL: `SELECT * FROM paliad.event_category_concepts ORDER BY category_id, concept_id`},
-		{SheetName: "ref__event_types", SQL: `SELECT * FROM paliad.event_types ORDER BY id`},
-		{SheetName: "ref__holidays", SQL: `SELECT * FROM paliad.holidays ORDER BY date, country`},
-		{SheetName: "ref__proceeding_types", SQL: `SELECT * FROM paliad.proceeding_types ORDER BY id`},
-		{SheetName: "ref__trigger_events", SQL: `SELECT * FROM paliad.trigger_events ORDER BY id`},
+		{SheetName: "ref__countries", Table: "paliad.countries", OrderBy: []string{"code"}},
+		{SheetName: "ref__courts", Table: "paliad.courts", OrderBy: []string{"id"}},
+		{SheetName: "ref__deadline_concept_event_types", Table: "paliad.deadline_concept_event_types", OrderBy: []string{"concept_id", "event_type_id"}},
+		{SheetName: "ref__deadline_concepts", Table: "paliad.deadline_concepts", OrderBy: []string{"id"}},
+		{SheetName: "ref__deadline_event_types", Table: "paliad.deadline_event_types", OrderBy: []string{"deadline_id", "event_type_id"}},
+		{SheetName: "ref__deadline_rules", Table: "paliad.deadline_rules_unified", OrderBy: []string{"id"}},
+		{SheetName: "ref__event_categories", Table: "paliad.event_categories", OrderBy: []string{"id"}},
+		{SheetName: "ref__event_category_concepts", Table: "paliad.event_category_concepts", OrderBy: []string{"event_category_id", "concept_id"}},
+		{SheetName: "ref__event_types", Table: "paliad.event_types", OrderBy: []string{"id"}},
+		{SheetName: "ref__holidays", Table: "paliad.holidays", OrderBy: []string{"date", "country"}},
+		{SheetName: "ref__proceeding_types", Table: "paliad.proceeding_types", OrderBy: []string{"id"}},
+		{SheetName: "ref__trigger_events", Table: "paliad.trigger_events", OrderBy: []string{"id"}},
 	}
 }
+
+// composeOrgSheetSQL turns one orgSheetSpec into the final SQL string,
+// using a per-table column set (typically loaded once per backup run
+// from information_schema.columns). Returns the SQL and the list of
+// ORDER BY columns that were dropped because they don't exist in the
+// live schema.
+//
+// Pure function — no DB access — so the missing-column behaviour is
+// unit-testable without a fixture database.
+//
+// Rules:
+//   - If spec.SQL is non-empty, return it unchanged (override path).
+//   - Otherwise build `SELECT * FROM <Table> [ORDER BY <kept-cols>]`.
+//   - Columns are kept in their declared order; missing ones recorded
+//     in `dropped` and omitted from ORDER BY.
+//   - If no ORDER BY columns survive, the ORDER BY clause is omitted.
+//
+// knownCols maps unqualified table names (e.g. "appointments") to the
+// set of columns they have. A table missing from knownCols is treated
+// as "no columns known" — every declared ORDER BY column gets dropped.
+func composeOrgSheetSQL(spec orgSheetSpec, knownCols map[string]map[string]struct{}) (sqlText string, dropped []string) {
+	if spec.SQL != "" {
+		return spec.SQL, nil
+	}
+	unqualified := spec.Table
+	if i := strings.IndexByte(unqualified, '.'); i >= 0 {
+		unqualified = unqualified[i+1:]
+	}
+	cols := knownCols[unqualified]
+	kept := make([]string, 0, len(spec.OrderBy))
+	for _, c := range spec.OrderBy {
+		if _, ok := cols[c]; ok {
+			kept = append(kept, c)
+		} else {
+			dropped = append(dropped, c)
+		}
+	}
+	var b strings.Builder
+	b.WriteString("SELECT * FROM ")
+	b.WriteString(spec.Table)
+	if len(kept) > 0 {
+		b.WriteString(" ORDER BY ")
+		b.WriteString(strings.Join(kept, ", "))
+	}
+	return b.String(), dropped
+}
+
+// loadOrgSheetColumns probes information_schema.columns once for every
+// table referenced by Table+OrderBy specs. Returns a lookup
+// {table_name → {column_name → {}}} restricted to the paliad schema.
+//
+// The queryer is whatever runs the backup's read snapshot — typically
+// the REPEATABLE READ tx opened in WriteOrg, so the schema snapshot
+// matches the row snapshot.
+func loadOrgSheetColumns(ctx context.Context, queryer sqlx.QueryerContext, specs []orgSheetSpec) (map[string]map[string]struct{}, error) {
+	tableSet := map[string]struct{}{}
+	for _, sp := range specs {
+		if sp.Table == "" {
+			continue // SQL-override sheets carry their own column refs
+		}
+		t := sp.Table
+		if i := strings.IndexByte(t, '.'); i >= 0 {
+			t = t[i+1:]
+		}
+		tableSet[t] = struct{}{}
+	}
+	if len(tableSet) == 0 {
+		return map[string]map[string]struct{}{}, nil
+	}
+	tables := make([]string, 0, len(tableSet))
+	for t := range tableSet {
+		tables = append(tables, t)
+	}
+	rows, err := queryer.QueryxContext(ctx, `
+		SELECT table_name, column_name
+		  FROM information_schema.columns
+		 WHERE table_schema = 'paliad'
+		   AND table_name = ANY($1)
+	`, tables)
+	if err != nil {
+		return nil, fmt.Errorf("probe paliad columns: %w", err)
+	}
+	defer rows.Close()
+	out := make(map[string]map[string]struct{}, len(tableSet))
+	for rows.Next() {
+		var table, column string
+		if err := rows.Scan(&table, &column); err != nil {
+			return nil, fmt.Errorf("scan paliad columns: %w", err)
+		}
+		set, ok := out[table]
+		if !ok {
+			set = map[string]struct{}{}
+			out[table] = set
+		}
+		set[column] = struct{}{}
+	}
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("iterate paliad columns: %w", err)
+	}
+	return out, nil
+}
+
+// resolveOrgSheets materialises an org-scope spec list into the
+// concrete []sheetQuery that writeBundle expects. Composes each
+// spec's SQL via composeOrgSheetSQL using a schema snapshot loaded
+// from the same queryer. Logs WARN per dropped ORDER BY column.
+func resolveOrgSheets(ctx context.Context, queryer sqlx.QueryerContext, specs []orgSheetSpec) ([]sheetQuery, error) {
+	knownCols, err := loadOrgSheetColumns(ctx, queryer, specs)
+	if err != nil {
+		return nil, err
+	}
+	out := make([]sheetQuery, 0, len(specs))
+	for _, sp := range specs {
+		sqlText, dropped := composeOrgSheetSQL(sp, knownCols)
+		for _, c := range dropped {
+			slog.Warn("backup: ORDER BY column dropped (not in schema)",
+				"sheet", sp.SheetName,
+				"table", sp.Table,
+				"column", c,
+			)
+		}
+		out = append(out, sheetQuery{
+			SheetName:   sp.SheetName,
+			SQL:         sqlText,
+			Args:        sp.Args,
+			DropColumns: sp.DropColumns,
+		})
+	}
+	return out, nil
+}

internal/services/fristenrechner.go

@@ -169,7 +169,7 @@ func (c *paliadCatalog) LoadRuleByID(ctx context.Context, ruleID string) (*model
 	var rule models.DeadlineRule
 	err := c.rules.db.GetContext(ctx, &rule,
 		`SELECT `+ruleColumns+`
-		   FROM paliad.deadline_rules
+		   FROM paliad.deadline_rules_unified
 		  WHERE id = $1 AND is_active = true`, ruleID)
 	if errors.Is(err, sql.ErrNoRows) {
 		return nil, lp.ErrUnknownRule
@@ -200,7 +200,7 @@ func (c *paliadCatalog) LoadRuleByCode(ctx context.Context, proceedingCode, subm
 	var rule models.DeadlineRule
 	err = c.rules.db.GetContext(ctx, &rule,
 		`SELECT `+ruleColumns+`
-		   FROM paliad.deadline_rules
+		   FROM paliad.deadline_rules_unified
 		  WHERE proceeding_type_id = $1 AND submission_code = $2 AND is_active = true`,
 		pt.ID, submissionCode)
 	if errors.Is(err, sql.ErrNoRows) {
@@ -311,7 +311,7 @@ func (c *paliadCatalog) LookupEvents(ctx context.Context, axes lp.EventLookupAxe
 		       pt.trigger_event_label_de AS pt_trigger_event_label_de,
 		       pt.trigger_event_label_en AS pt_trigger_event_label_en,
 		       pt.appeal_target AS pt_appeal_target
-		  FROM paliad.deadline_rules dr
+		  FROM paliad.deadline_rules_unified dr
 		  JOIN paliad.proceeding_types pt ON pt.id = dr.proceeding_type_id
 		 WHERE ` + strings.Join(where, "\n   AND ") + `
 		 ORDER BY dr.proceeding_type_id, dr.sequence_order`
@@ -516,6 +516,61 @@ func computeDepths(
 	return depths
 }
 
+// LoadScenarios lists scenarios visible to the caller (Slice D,
+// m/paliad#124 §5, mig 145). RLS on paliad.scenarios enforces:
+// project-scoped rows require paliad.can_see_project(project_id);
+// abstract rows require created_by = auth.uid(). The filter narrows
+// the SELECT (project_id-bound, abstract-for-user, or all).
+func (c *paliadCatalog) LoadScenarios(ctx context.Context, filter lp.ScenarioFilter) ([]lp.Scenario, error) {
+	where := []string{}
+	args := []any{}
+	add := func(clause string, val any) {
+		args = append(args, val)
+		where = append(where, fmt.Sprintf(clause, len(args)))
+	}
+	if filter.ProjectID != nil {
+		add("project_id = $%d", *filter.ProjectID)
+	}
+	if filter.AbstractForUser != nil {
+		where = append(where, "project_id IS NULL")
+		add("created_by = $%d", *filter.AbstractForUser)
+	}
+	query := `SELECT id, project_id, name, description, spec,
+	                 created_by, created_at, updated_at
+	            FROM paliad.scenarios`
+	if len(where) > 0 {
+		query += " WHERE " + strings.Join(where, " AND ")
+	}
+	query += " ORDER BY created_at DESC"
+
+	var rows []lp.Scenario
+	if err := c.rules.db.SelectContext(ctx, &rows, query, args...); err != nil {
+		return nil, fmt.Errorf("load scenarios: %w", err)
+	}
+	return rows, nil
+}
+
+// MatchScenario returns the scenario with the given id, or
+// lp.ErrUnknownScenario if not visible / not found. RLS gates
+// visibility; a not-found result could mean "doesn't exist" OR
+// "exists but you can't see it" — either way the caller treats it
+// as unknown.
+func (c *paliadCatalog) MatchScenario(ctx context.Context, id uuid.UUID) (*lp.Scenario, error) {
+	var s lp.Scenario
+	err := c.rules.db.GetContext(ctx, &s,
+		`SELECT id, project_id, name, description, spec,
+		        created_by, created_at, updated_at
+		   FROM paliad.scenarios
+		  WHERE id = $1`, id)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, lp.ErrUnknownScenario
+	}
+	if err != nil {
+		return nil, fmt.Errorf("match scenario %q: %w", id, err)
+	}
+	return &s, nil
+}
+
 // _ proves paliadCatalog satisfies lp.Catalog at compile time.
 var _ lp.Catalog = (*paliadCatalog)(nil)
 

internal/services/lookup_events_test.go

@@ -144,7 +144,7 @@ func TestLookupEvents(t *testing.T) {
 		}
 	})
 
-	t.Run("appeal_target=schadensbemessung returns empty (no rules seeded yet)", func(t *testing.T) {
+	t.Run("appeal_target=schadensbemessung returns upc.apl merits rules (mig 138 backfill)", func(t *testing.T) {
 		matches, err := catalog.LookupEvents(ctx, lp.EventLookupAxes{
 			Jurisdiction: "UPC",
 			AppealTarget: lp.AppealTargetSchadensbemessung,
@@ -152,8 +152,68 @@ func TestLookupEvents(t *testing.T) {
 		if err != nil {
 			t.Fatalf("LookupEvents: %v", err)
 		}
-		if len(matches) != 0 {
-			t.Errorf("schadensbemessung should be empty until rules seeded; got %d rows", len(matches))
+		// mig 138 (t-paliad-303, m/paliad#134) extends the 7 merits-track
+		// rules under upc.apl.unified with applies_to_target ⊇ {schadensbemessung}
+		// because R.224 is uniform across substantive R.118 decisions.
+		if len(matches) == 0 {
+			t.Fatal("expected upc.apl schadensbemessung rules after mig 138 backfill")
+		}
+		for _, m := range matches {
+			if m.DepthFromAnchor != 1 {
+				continue
+			}
+			found := false
+			for _, t := range m.Rule.AppliesToTarget {
+				if t == lp.AppealTargetSchadensbemessung {
+					found = true
+					break
+				}
+			}
+			if !found {
+				t.Errorf("anchor row %s missing schadensbemessung target: %v",
+					m.Rule.Name, m.Rule.AppliesToTarget)
+			}
+			if m.ProceedingType.Code != "upc.apl.unified" {
+				t.Errorf("anchor row %s came from %s, want upc.apl.unified",
+					m.Rule.Name, m.ProceedingType.Code)
+			}
+		}
+	})
+
+	t.Run("appeal_target=bucheinsicht returns upc.apl order rules (mig 138 backfill)", func(t *testing.T) {
+		matches, err := catalog.LookupEvents(ctx, lp.EventLookupAxes{
+			Jurisdiction: "UPC",
+			AppealTarget: lp.AppealTargetBucheinsicht,
+		}, lp.EventLookupDepthAllFollowing)
+		if err != nil {
+			t.Fatalf("LookupEvents: %v", err)
+		}
+		// mig 138 (t-paliad-303, m/paliad#134) extends the 7 order-track
+		// rules under upc.apl.unified with applies_to_target ⊇ {bucheinsicht}
+		// because R.220.2 / R.224.2.b / R.235.2 / R.237 / R.238.2 are
+		// uniform across the orders they appeal.
+		if len(matches) == 0 {
+			t.Fatal("expected upc.apl bucheinsicht rules after mig 138 backfill")
+		}
+		for _, m := range matches {
+			if m.DepthFromAnchor != 1 {
+				continue
+			}
+			found := false
+			for _, t := range m.Rule.AppliesToTarget {
+				if t == lp.AppealTargetBucheinsicht {
+					found = true
+					break
+				}
+			}
+			if !found {
+				t.Errorf("anchor row %s missing bucheinsicht target: %v",
+					m.Rule.Name, m.Rule.AppliesToTarget)
+			}
+			if m.ProceedingType.Code != "upc.apl.unified" {
+				t.Errorf("anchor row %s came from %s, want upc.apl.unified",
+					m.Rule.Name, m.ProceedingType.Code)
+			}
 		}
 	})
 }

internal/services/projection_service.go

@@ -1767,7 +1767,7 @@ func (s *ProjectionService) lookupRuleBySubmissionCode(ctx context.Context, ptID
 	var rule models.DeadlineRule
 	err := s.db.GetContext(ctx, &rule,
 		`SELECT `+ruleColumns+`
-		   FROM paliad.deadline_rules
+		   FROM paliad.deadline_rules_unified
 		  WHERE proceeding_type_id = $1 AND submission_code = $2 AND is_active = true`,
 		ptID, code)
 	if errors.Is(err, sql.ErrNoRows) {
@@ -1784,7 +1784,7 @@ func (s *ProjectionService) lookupRuleByID(ctx context.Context, id uuid.UUID) (*
 	var rule models.DeadlineRule
 	err := s.db.GetContext(ctx, &rule,
 		`SELECT `+ruleColumns+`
-		   FROM paliad.deadline_rules
+		   FROM paliad.deadline_rules_unified
 		  WHERE id = $1`, id)
 	if err != nil {
 		return nil, fmt.Errorf("lookup rule by id: %w", err)

internal/services/rule_editor_orphans.go

@@ -117,7 +117,7 @@ func (s *RuleEditorService) ListOrphans(ctx context.Context) ([]Orphan, error) {
 		}
 		if err := s.db.SelectContext(ctx, &cs, `
 			SELECT id, rule_code, name, name_en
-			  FROM paliad.deadline_rules
+			  FROM paliad.deadline_rules_unified
 			 WHERE id = ANY($1::uuid[])`, pq.Array(uuidStrs)); err != nil {
 			return nil, fmt.Errorf("list orphan candidate rules: %w", err)
 		}
@@ -221,6 +221,12 @@ func (s *RuleEditorService) ResolveOrphan(ctx context.Context, orphanID uuid.UUI
 	); err != nil {
 		return fmt.Errorf("set deadline rule_id: %w", err)
 	}
+	// Slice B.2 dual-write (t-paliad-305): mirror the new linkage onto
+	// the parallel deadlines.procedural_event_id + sequencing_rule_id
+	// columns so they don't drift from rule_id.
+	if err := syncDeadlineDualLinks(ctx, tx, oc.DeadlineID); err != nil {
+		return err
+	}
 	if _, err := tx.ExecContext(ctx,
 		`UPDATE paliad.deadline_rule_backfill_orphans
 		    SET resolved_at      = $1,

internal/services/rule_editor_service.go

@@ -209,6 +209,14 @@ func (s *RuleEditorService) Create(ctx context.Context, input CreateRuleInput, r
 		return nil, fmt.Errorf("insert rule: %w", err)
 	}
 
+	// Slice B.2 dual-write (t-paliad-305): project the new row into
+	// legal_sources / procedural_events / sequencing_rules in the same
+	// transaction so the parallel tables stay in lock-step with
+	// deadline_rules through the B.3 read-cutover window.
+	if err := syncDualWriteFromDeadlineRule(ctx, tx, id); err != nil {
+		return nil, err
+	}
+
 	if err := tx.Commit(); err != nil {
 		return nil, fmt.Errorf("commit create: %w", err)
 	}
@@ -276,6 +284,10 @@ func (s *RuleEditorService) UpdateDraft(ctx context.Context, id uuid.UUID, patch
 	if _, err := tx.ExecContext(ctx, q, args...); err != nil {
 		return nil, fmt.Errorf("update rule draft: %w", err)
 	}
+	// Slice B.2 dual-write (t-paliad-305).
+	if err := syncDualWriteFromDeadlineRule(ctx, tx, id); err != nil {
+		return nil, err
+	}
 	if err := tx.Commit(); err != nil {
 		return nil, fmt.Errorf("commit update: %w", err)
 	}
@@ -336,6 +348,14 @@ func (s *RuleEditorService) CloneAsDraft(ctx context.Context, id uuid.UUID, reas
 	); err != nil {
 		return nil, fmt.Errorf("clone rule as draft: %w", err)
 	}
+	// Slice B.2 dual-write (t-paliad-305): new draft gets its own
+	// procedural_events + sequencing_rules row. The synthetic-code
+	// branch fires here when the source rule had NULL submission_code
+	// (the clone inherits the NULL and mints a fresh 'null.<8hex>'
+	// derived from newID).
+	if err := syncDualWriteFromDeadlineRule(ctx, tx, newID); err != nil {
+		return nil, err
+	}
 	if err := tx.Commit(); err != nil {
 		return nil, fmt.Errorf("commit clone: %w", err)
 	}
@@ -392,6 +412,18 @@ func (s *RuleEditorService) Publish(ctx context.Context, id uuid.UUID, reason st
 		}
 	}
 
+	// Slice B.2 dual-write (t-paliad-305): sync both sides — the newly
+	// published draft AND the cloned-from peer that just flipped to
+	// archived (if any).
+	if err := syncDualWriteFromDeadlineRule(ctx, tx, id); err != nil {
+		return nil, err
+	}
+	if current.DraftOf != nil {
+		if err := syncDualWriteFromDeadlineRule(ctx, tx, *current.DraftOf); err != nil {
+			return nil, err
+		}
+	}
+
 	if err := tx.Commit(); err != nil {
 		return nil, fmt.Errorf("commit publish: %w", err)
 	}
@@ -459,6 +491,12 @@ func (s *RuleEditorService) flipLifecycle(ctx context.Context, id uuid.UUID, tar
 		}
 	}
 
+	// Slice B.2 dual-write (t-paliad-305): mirror the lifecycle flip
+	// onto sequencing_rules + procedural_events.
+	if err := syncDualWriteFromDeadlineRule(ctx, tx, id); err != nil {
+		return nil, err
+	}
+
 	if err := tx.Commit(); err != nil {
 		return nil, fmt.Errorf("commit flip: %w", err)
 	}
@@ -598,7 +636,7 @@ func (s *RuleEditorService) ListRules(ctx context.Context, f ListRulesFilter) ([
 		where = "WHERE " + strings.Join(conds, " AND ")
 	}
 	query := `SELECT ` + ruleColumns + `
-		   FROM paliad.deadline_rules
+		   FROM paliad.deadline_rules_unified
 		   ` + where + `
 		  ORDER BY proceeding_type_id NULLS LAST, sequence_order
 		  LIMIT ` + addArg(f.Limit) + ` OFFSET ` + addArg(f.Offset)
@@ -618,7 +656,7 @@ func (s *RuleEditorService) GetByID(ctx context.Context, id uuid.UUID) (*models.
 func (s *RuleEditorService) getByID(ctx context.Context, id uuid.UUID) (*models.DeadlineRule, error) {
 	var r models.DeadlineRule
 	err := s.db.GetContext(ctx, &r,
-		`SELECT `+ruleColumns+` FROM paliad.deadline_rules WHERE id = $1`, id)
+		`SELECT `+ruleColumns+` FROM paliad.deadline_rules_unified WHERE id = $1`, id)
 	if errors.Is(err, sql.ErrNoRows) {
 		return nil, ErrRuleNotFound
 	}
@@ -677,7 +715,7 @@ func (s *RuleEditorService) validateSpawnNoCycle(ctx context.Context, ruleID *uu
 		visited[current] = true
 		var nexts []sql.NullInt64
 		q := `SELECT DISTINCT spawn_proceeding_type_id::bigint
-		        FROM paliad.deadline_rules
+		        FROM paliad.deadline_rules_unified
 		       WHERE proceeding_type_id = $1
 		         AND is_spawn = true
 		         AND spawn_proceeding_type_id IS NOT NULL

internal/services/scenario_service.go

@@ -0,0 +1,347 @@
+package services
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+
+	"mgit.msbls.de/m/paliad/internal/models"
+	lp "mgit.msbls.de/m/paliad/pkg/litigationplanner"
+)
+
+// ScenarioService reads + writes paliad.scenarios — named compositions
+// of existing proceedings + flags + per-card choices + anchor dates,
+// switchable per project or saved as abstract templates on
+// /tools/verfahrensablauf. Slice D, m/paliad#124 §5, mig 145.
+//
+// Visibility:
+//   - Project-scoped scenarios (project_id NOT NULL): require
+//     can_see_project on the bound project (mirrors
+//     EventChoiceService.requireProjectVisible).
+//   - Abstract scenarios (project_id IS NULL): owner-only. Only
+//     created_by can read / mutate.
+//
+// The service applies these checks in application code; paliad.scenarios
+// also has RLS policies (mig 145) as defense-in-depth for callers that
+// connect through Supabase Auth's auth.uid() session.
+type ScenarioService struct {
+	db       *sqlx.DB
+	projects *ProjectService
+	rules    *DeadlineRuleService
+}
+
+// NewScenarioService wires the service to its dependencies.
+func NewScenarioService(db *sqlx.DB, projects *ProjectService, rules *DeadlineRuleService) *ScenarioService {
+	return &ScenarioService{db: db, projects: projects, rules: rules}
+}
+
+// Sentinel errors. Mirrors EventChoiceService + the lp package errors
+// so handlers can map cleanly to HTTP statuses.
+var (
+	ErrScenarioNotVisible = errors.New("scenario not visible to caller")
+)
+
+// CreateScenarioInput is the payload for POST /api/scenarios. project_id
+// nil = abstract scenario (saved Verfahrensablauf template).
+type CreateScenarioInput struct {
+	ProjectID   *uuid.UUID      `json:"project_id,omitempty"`
+	Name        string          `json:"name"`
+	Description *string         `json:"description,omitempty"`
+	Spec        json.RawMessage `json:"spec"`
+}
+
+// Create inserts a new scenario after validating the spec.
+func (s *ScenarioService) Create(ctx context.Context, userID uuid.UUID, input CreateScenarioInput) (*lp.Scenario, error) {
+	if input.Name == "" {
+		return nil, fmt.Errorf("%w: name required", ErrInvalidInput)
+	}
+	if err := s.validateSpec(ctx, input.Spec); err != nil {
+		return nil, err
+	}
+	if input.ProjectID != nil {
+		if err := s.requireProjectVisible(ctx, userID, *input.ProjectID); err != nil {
+			return nil, err
+		}
+	}
+
+	var out lp.Scenario
+	err := s.db.GetContext(ctx, &out,
+		`INSERT INTO paliad.scenarios (project_id, name, description, spec, created_by)
+		      VALUES ($1, $2, $3, $4, $5)
+		   RETURNING id, project_id, name, description, spec, created_by,
+		             created_at, updated_at`,
+		input.ProjectID, input.Name, input.Description,
+		[]byte(input.Spec), userID)
+	if err != nil {
+		return nil, fmt.Errorf("create scenario: %w", err)
+	}
+	return &out, nil
+}
+
+// Get returns one scenario by id after a visibility check.
+func (s *ScenarioService) Get(ctx context.Context, userID, scenarioID uuid.UUID) (*lp.Scenario, error) {
+	var sc lp.Scenario
+	err := s.db.GetContext(ctx, &sc,
+		`SELECT id, project_id, name, description, spec, created_by,
+		        created_at, updated_at
+		   FROM paliad.scenarios
+		  WHERE id = $1`, scenarioID)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, lp.ErrUnknownScenario
+	}
+	if err != nil {
+		return nil, fmt.Errorf("get scenario: %w", err)
+	}
+	if err := s.requireVisible(ctx, userID, &sc); err != nil {
+		return nil, err
+	}
+	return &sc, nil
+}
+
+// ListForProject returns scenarios attached to one project, ordered by
+// created_at desc.
+func (s *ScenarioService) ListForProject(ctx context.Context, userID, projectID uuid.UUID) ([]lp.Scenario, error) {
+	if err := s.requireProjectVisible(ctx, userID, projectID); err != nil {
+		return nil, err
+	}
+	out := []lp.Scenario{}
+	err := s.db.SelectContext(ctx, &out,
+		`SELECT id, project_id, name, description, spec, created_by,
+		        created_at, updated_at
+		   FROM paliad.scenarios
+		  WHERE project_id = $1
+		  ORDER BY created_at DESC`, projectID)
+	if err != nil {
+		return nil, fmt.Errorf("list scenarios for project: %w", err)
+	}
+	return out, nil
+}
+
+// ListAbstractForUser returns the calling user's abstract scenarios.
+func (s *ScenarioService) ListAbstractForUser(ctx context.Context, userID uuid.UUID) ([]lp.Scenario, error) {
+	out := []lp.Scenario{}
+	err := s.db.SelectContext(ctx, &out,
+		`SELECT id, project_id, name, description, spec, created_by,
+		        created_at, updated_at
+		   FROM paliad.scenarios
+		  WHERE project_id IS NULL AND created_by = $1
+		  ORDER BY created_at DESC`, userID)
+	if err != nil {
+		return nil, fmt.Errorf("list abstract scenarios: %w", err)
+	}
+	return out, nil
+}
+
+// PatchScenarioInput is the payload for PATCH /api/scenarios/{id}. Any
+// field nil means "don't change". Spec replacement re-runs validation.
+type PatchScenarioInput struct {
+	Name        *string         `json:"name,omitempty"`
+	Description *string         `json:"description,omitempty"`
+	Spec        json.RawMessage `json:"spec,omitempty"`
+}
+
+// Patch updates one or more scenario fields. Visibility check fires
+// first (the caller must already see the scenario to mutate it).
+func (s *ScenarioService) Patch(ctx context.Context, userID, scenarioID uuid.UUID, input PatchScenarioInput) (*lp.Scenario, error) {
+	current, err := s.Get(ctx, userID, scenarioID)
+	if err != nil {
+		return nil, err
+	}
+	if len(input.Spec) > 0 {
+		if err := s.validateSpec(ctx, input.Spec); err != nil {
+			return nil, err
+		}
+	}
+
+	sets := []string{}
+	args := []any{}
+	add := func(clause string, val any) {
+		args = append(args, val)
+		sets = append(sets, fmt.Sprintf(clause, len(args)))
+	}
+	if input.Name != nil {
+		add("name = $%d", *input.Name)
+	}
+	if input.Description != nil {
+		add("description = $%d", *input.Description)
+	}
+	if len(input.Spec) > 0 {
+		add("spec = $%d", []byte(input.Spec))
+	}
+	if len(sets) == 0 {
+		return current, nil
+	}
+	args = append(args, scenarioID)
+	query := fmt.Sprintf(`UPDATE paliad.scenarios SET %s
+	    WHERE id = $%d
+	RETURNING id, project_id, name, description, spec, created_by,
+	          created_at, updated_at`, joinSets(sets), len(args))
+	var out lp.Scenario
+	if err := s.db.GetContext(ctx, &out, query, args...); err != nil {
+		return nil, fmt.Errorf("patch scenario: %w", err)
+	}
+	return &out, nil
+}
+
+// SetActive points a project at one of its scenarios. Pass nil to
+// clear (revert to ad-hoc per-card choice state).
+func (s *ScenarioService) SetActive(ctx context.Context, userID, projectID uuid.UUID, scenarioID *uuid.UUID) error {
+	if err := s.requireProjectVisible(ctx, userID, projectID); err != nil {
+		return err
+	}
+	if scenarioID != nil {
+		// Ensure scenario exists + belongs to this project. A scenario
+		// from a different project (or an abstract one) can't be the
+		// active scenario on this project.
+		sc, err := s.Get(ctx, userID, *scenarioID)
+		if err != nil {
+			return err
+		}
+		if sc.ProjectID == nil || *sc.ProjectID != projectID {
+			return fmt.Errorf("%w: scenario %s is not attached to project %s",
+				ErrInvalidInput, *scenarioID, projectID)
+		}
+	}
+	_, err := s.db.ExecContext(ctx,
+		`UPDATE paliad.projects SET active_scenario_id = $1 WHERE id = $2`,
+		scenarioID, projectID)
+	if err != nil {
+		return fmt.Errorf("set active scenario: %w", err)
+	}
+	return nil
+}
+
+// Delete removes a scenario. Project's active_scenario_id is cleared
+// automatically via the FK's ON DELETE SET NULL.
+func (s *ScenarioService) Delete(ctx context.Context, userID, scenarioID uuid.UUID) error {
+	// Visibility check via Get — also resolves the existence question.
+	if _, err := s.Get(ctx, userID, scenarioID); err != nil {
+		return err
+	}
+	if _, err := s.db.ExecContext(ctx,
+		`DELETE FROM paliad.scenarios WHERE id = $1`, scenarioID); err != nil {
+		return fmt.Errorf("delete scenario: %w", err)
+	}
+	return nil
+}
+
+// requireVisible enforces the per-row visibility rule:
+//   - project_id NOT NULL → caller must see the project
+//   - project_id IS NULL  → caller must be the row's created_by
+func (s *ScenarioService) requireVisible(ctx context.Context, userID uuid.UUID, sc *lp.Scenario) error {
+	if sc.ProjectID != nil {
+		return s.requireProjectVisible(ctx, userID, *sc.ProjectID)
+	}
+	if sc.CreatedBy == nil || *sc.CreatedBy != userID {
+		return ErrScenarioNotVisible
+	}
+	return nil
+}
+
+// requireProjectVisible mirrors EventChoiceService.requireProjectVisible
+// (visibility via can_see_project). Cheap re-implementation — keeps the
+// call-graph small + avoids a cross-service dep.
+func (s *ScenarioService) requireProjectVisible(ctx context.Context, userID, projectID uuid.UUID) error {
+	var visible bool
+	err := s.db.GetContext(ctx, &visible,
+		`SELECT EXISTS (
+		    SELECT 1 FROM paliad.users u
+		     WHERE u.id = $1 AND u.global_role = 'global_admin'
+		) OR EXISTS (
+		    SELECT 1 FROM paliad.projects p
+		     JOIN paliad.project_teams pt ON pt.project_id = ANY(
+		            string_to_array(p.path, '.')::uuid[]
+		          )
+		    WHERE p.id = $2 AND pt.user_id = $1
+		)`, userID, projectID)
+	if err != nil {
+		return fmt.Errorf("check project visibility: %w", err)
+	}
+	if !visible {
+		return ErrScenarioNotVisible
+	}
+	return nil
+}
+
+// validateSpec checks the jsonb spec is well-formed, has the right
+// version, and that every referenced proceeding code + submission code
+// resolves to an active row in the live catalog. Surfaces friendly
+// errors wrapping ErrInvalidInput so the handler can map to a 400.
+func (s *ScenarioService) validateSpec(ctx context.Context, raw json.RawMessage) error {
+	if len(raw) == 0 {
+		return fmt.Errorf("%w: spec is required", ErrInvalidInput)
+	}
+	parsed, err := lp.ParseSpec(lp.NullableJSON(raw))
+	if err != nil {
+		return fmt.Errorf("%w: %v", ErrInvalidInput, err)
+	}
+	if _, err := parsed.PrimaryProceeding(); err != nil {
+		return fmt.Errorf("%w: %v", ErrInvalidInput, err)
+	}
+	if parsed.BaseTriggerDate != "" {
+		if _, err := time.Parse("2006-01-02", parsed.BaseTriggerDate); err != nil {
+			return fmt.Errorf("%w: base_trigger_date %q is not YYYY-MM-DD", ErrInvalidInput, parsed.BaseTriggerDate)
+		}
+	}
+	for i, p := range parsed.Proceedings {
+		if p.Code == "" {
+			return fmt.Errorf("%w: proceedings[%d].code is empty", ErrInvalidInput, i)
+		}
+		if p.Role != lp.ScenarioRolePrimary && p.Role != lp.ScenarioRolePeer {
+			return fmt.Errorf("%w: proceedings[%d].role=%q must be 'primary' or 'peer'",
+				ErrInvalidInput, i, p.Role)
+		}
+		if p.AppealTarget != "" && !lp.IsValidAppealTarget(p.AppealTarget) {
+			return fmt.Errorf("%w: proceedings[%d].appeal_target=%q not in %v",
+				ErrInvalidInput, i, p.AppealTarget, lp.AppealTargets)
+		}
+		if p.TriggerDateOverride != "" {
+			if _, err := time.Parse("2006-01-02", p.TriggerDateOverride); err != nil {
+				return fmt.Errorf("%w: proceedings[%d].trigger_date_override %q is not YYYY-MM-DD",
+					ErrInvalidInput, i, p.TriggerDateOverride)
+			}
+		}
+		for code, dateStr := range p.AnchorOverrides {
+			if _, err := time.Parse("2006-01-02", dateStr); err != nil {
+				return fmt.Errorf("%w: proceedings[%d].anchor_overrides[%q]=%q is not YYYY-MM-DD",
+					ErrInvalidInput, i, code, dateStr)
+			}
+		}
+		// Resolve code against active proceedings.
+		var exists bool
+		if err := s.db.GetContext(ctx, &exists,
+			`SELECT EXISTS(SELECT 1 FROM paliad.proceeding_types
+			               WHERE code = $1 AND is_active = true)`,
+			p.Code); err != nil {
+			return fmt.Errorf("validate spec proceedings[%d]: %w", i, err)
+		}
+		if !exists {
+			return fmt.Errorf("%w: proceedings[%d].code=%q is not an active proceeding_type",
+				ErrInvalidInput, i, p.Code)
+		}
+	}
+	return nil
+}
+
+// joinSets joins SET clauses with ", ". Tiny utility, kept here to
+// avoid cross-package strings.Join indirection.
+func joinSets(sets []string) string {
+	out := ""
+	for i, s := range sets {
+		if i > 0 {
+			out += ", "
+		}
+		out += s
+	}
+	return out
+}
+
+// Suppress unused-import diagnostic when models isn't referenced
+// (kept for future shape-evolution; canonical scenario row lives in lp).
+var _ = models.NullableJSON(nil)

internal/services/submission_base_service.go

@@ -0,0 +1,274 @@
+package services
+
+// Submission base catalog service — Composer Slice A (t-paliad-313,
+// design doc docs/design-submission-generator-v2-2026-05-26.md §4.2 +
+// §5.1).
+//
+// Each row in paliad.submission_bases maps a stable slug onto a Gitea
+// path (the .docx body) plus a JSON section spec that drives the
+// editor's default section seeding. Slice A surfaces this catalog via
+// a sidebar picker and uses GetDefaultForCode to pre-fill base_id on
+// new drafts.
+//
+// Read-only — admin mutations land in Slice C's /admin/submission-bases
+// editor. Visibility is wide-open SELECT (the catalog is shared
+// firm-wide); RLS denies mutations by default.
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+	"github.com/lib/pq"
+)
+
+// SubmissionBase mirrors a row in paliad.submission_bases.
+type SubmissionBase struct {
+	ID               uuid.UUID      `db:"id"                 json:"id"`
+	Slug             string         `db:"slug"               json:"slug"`
+	Firm             *string        `db:"firm"               json:"firm,omitempty"`
+	ProceedingFamily *string        `db:"proceeding_family"  json:"proceeding_family,omitempty"`
+	LabelDE          string         `db:"label_de"           json:"label_de"`
+	LabelEN          string         `db:"label_en"           json:"label_en"`
+	DescriptionDE    *string        `db:"description_de"     json:"description_de,omitempty"`
+	DescriptionEN    *string        `db:"description_en"     json:"description_en,omitempty"`
+	GiteaPath        string         `db:"gitea_path"         json:"gitea_path"`
+	SectionSpecRaw   []byte         `db:"section_spec"       json:"-"`
+	IsDefaultForRaw  pq.StringArray `db:"is_default_for"     json:"-"`
+	IsActive         bool           `db:"is_active"          json:"is_active"`
+
+	// SectionSpec is the parsed section spec; populated on read by the
+	// service so callers don't have to unmarshal manually.
+	SectionSpec BaseSectionSpec `json:"section_spec"`
+
+	// IsDefaultFor is the parsed string-slice form of the
+	// is_default_for column.
+	IsDefaultFor []string `json:"is_default_for"`
+}
+
+// BaseSectionSpec is the parsed shape of submission_bases.section_spec.
+// Slice A consumes Defaults to seed submission_sections rows on draft
+// create; later slices consume Stylemap (Slice B's MD→OOXML walker) and
+// Version (forward compat).
+type BaseSectionSpec struct {
+	Version  int                        `json:"version"`
+	Stylemap map[string]string          `json:"stylemap"`
+	Defaults []BaseSectionSpecDefault   `json:"defaults"`
+}
+
+// BaseSectionSpecDefault declares one default section per base. SeedMD*
+// is the Markdown copied into submission_sections.content_md_* on draft
+// create. Empty seed = blank prose section.
+type BaseSectionSpecDefault struct {
+	SectionKey string `json:"section_key"`
+	Kind       string `json:"kind"`
+	OrderIndex int    `json:"order_index"`
+	LabelDE    string `json:"label_de"`
+	LabelEN    string `json:"label_en"`
+	Included   bool   `json:"included"`
+	SeedMDDE   string `json:"seed_md_de"`
+	SeedMDEN   string `json:"seed_md_en"`
+}
+
+// BaseService reads the catalog. No mutations in Slice A.
+type BaseService struct {
+	db *sqlx.DB
+}
+
+// NewBaseService wires the service.
+func NewBaseService(db *sqlx.DB) *BaseService {
+	return &BaseService{db: db}
+}
+
+// ErrBaseNotFound is the sentinel for "no base with that id/slug".
+var ErrBaseNotFound = errors.New("submission base: not found")
+
+const baseColumns = `id, slug, firm, proceeding_family, label_de, label_en,
+                     description_de, description_en, gitea_path,
+                     section_spec, is_default_for, is_active`
+
+// List returns every active base ordered by firm-then-label.
+// firmFilter (when non-empty) restricts to rows where firm matches OR
+// firm IS NULL — the picker shows the firm's own bases plus the
+// firm-agnostic ones.
+func (s *BaseService) List(ctx context.Context, firmFilter string) ([]SubmissionBase, error) {
+	var rows []SubmissionBase
+	var err error
+	if firmFilter == "" {
+		err = s.db.SelectContext(ctx, &rows,
+			`SELECT `+baseColumns+`
+			   FROM paliad.submission_bases
+			  WHERE is_active
+			  ORDER BY COALESCE(firm, ''), label_de`)
+	} else {
+		err = s.db.SelectContext(ctx, &rows,
+			`SELECT `+baseColumns+`
+			   FROM paliad.submission_bases
+			  WHERE is_active AND (firm = $1 OR firm IS NULL)
+			  ORDER BY (firm IS NULL), label_de`,
+			firmFilter)
+	}
+	if err != nil {
+		return nil, fmt.Errorf("list submission bases: %w", err)
+	}
+	for i := range rows {
+		if err := rows[i].decode(); err != nil {
+			return nil, err
+		}
+	}
+	return rows, nil
+}
+
+// GetByID fetches one base by uuid.
+func (s *BaseService) GetByID(ctx context.Context, id uuid.UUID) (*SubmissionBase, error) {
+	var b SubmissionBase
+	err := s.db.GetContext(ctx, &b,
+		`SELECT `+baseColumns+`
+		   FROM paliad.submission_bases
+		  WHERE id = $1 AND is_active`,
+		id)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrBaseNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("get submission base by id: %w", err)
+	}
+	if err := b.decode(); err != nil {
+		return nil, err
+	}
+	return &b, nil
+}
+
+// GetBySlug fetches one base by stable slug ("hlc-letterhead", …).
+func (s *BaseService) GetBySlug(ctx context.Context, slug string) (*SubmissionBase, error) {
+	var b SubmissionBase
+	err := s.db.GetContext(ctx, &b,
+		`SELECT `+baseColumns+`
+		   FROM paliad.submission_bases
+		  WHERE slug = $1 AND is_active`,
+		slug)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrBaseNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("get submission base by slug: %w", err)
+	}
+	if err := b.decode(); err != nil {
+		return nil, err
+	}
+	return &b, nil
+}
+
+// GetDefaultForCode picks the base SubmissionDraftService.Create should
+// seed for a new draft, given the requesting firm and the draft's
+// submission_code. Priority:
+//
+//  1. firm-matched base whose is_default_for[] contains the exact code.
+//  2. firm-matched base whose proceeding_family matches the code's
+//     family (first three dot-segments, e.g. "de.inf.lg" from
+//     "de.inf.lg.erwidg").
+//  3. firm-matched base with NULL proceeding_family (firm-agnostic
+//     fallback within the firm).
+//  4. firm-NULL (cross-firm) base by family match.
+//  5. firm-NULL base with NULL family — the universal neutral fallback.
+//  6. first active row (deterministic ordering on (firm IS NULL,
+//     label_de)).
+//
+// Returns ErrBaseNotFound if the table is empty.
+func (s *BaseService) GetDefaultForCode(ctx context.Context, firm, submissionCode string) (*SubmissionBase, error) {
+	family := familyOfCode(submissionCode)
+
+	tryQueries := []struct {
+		sql    string
+		args   []any
+	}{
+		{
+			`SELECT ` + baseColumns + `
+			   FROM paliad.submission_bases
+			  WHERE is_active AND firm = $1 AND $2 = ANY(is_default_for)
+			  ORDER BY label_de LIMIT 1`,
+			[]any{firm, submissionCode},
+		},
+		{
+			`SELECT ` + baseColumns + `
+			   FROM paliad.submission_bases
+			  WHERE is_active AND firm = $1 AND proceeding_family = $2
+			  ORDER BY label_de LIMIT 1`,
+			[]any{firm, family},
+		},
+		{
+			`SELECT ` + baseColumns + `
+			   FROM paliad.submission_bases
+			  WHERE is_active AND firm = $1 AND proceeding_family IS NULL
+			  ORDER BY label_de LIMIT 1`,
+			[]any{firm},
+		},
+		{
+			`SELECT ` + baseColumns + `
+			   FROM paliad.submission_bases
+			  WHERE is_active AND firm IS NULL AND proceeding_family = $1
+			  ORDER BY label_de LIMIT 1`,
+			[]any{family},
+		},
+		{
+			`SELECT ` + baseColumns + `
+			   FROM paliad.submission_bases
+			  WHERE is_active AND firm IS NULL AND proceeding_family IS NULL
+			  ORDER BY label_de LIMIT 1`,
+			[]any{},
+		},
+		{
+			`SELECT ` + baseColumns + `
+			   FROM paliad.submission_bases
+			  WHERE is_active
+			  ORDER BY (firm IS NULL), label_de LIMIT 1`,
+			[]any{},
+		},
+	}
+
+	for _, q := range tryQueries {
+		var b SubmissionBase
+		err := s.db.GetContext(ctx, &b, q.sql, q.args...)
+		if errors.Is(err, sql.ErrNoRows) {
+			continue
+		}
+		if err != nil {
+			return nil, fmt.Errorf("get default base: %w", err)
+		}
+		if err := b.decode(); err != nil {
+			return nil, err
+		}
+		return &b, nil
+	}
+	return nil, ErrBaseNotFound
+}
+
+// familyOfCode returns the first three dot-segments of a submission_code.
+// "de.inf.lg.erwidg" → "de.inf.lg". Codes with fewer than three segments
+// pass through unchanged (none in the corpus today, but safe).
+func familyOfCode(code string) string {
+	parts := strings.SplitN(code, ".", 4)
+	if len(parts) <= 3 {
+		return code
+	}
+	return strings.Join(parts[:3], ".")
+}
+
+// decode fills the parsed views from the raw scan fields.
+func (b *SubmissionBase) decode() error {
+	if len(b.SectionSpecRaw) > 0 {
+		if err := json.Unmarshal(b.SectionSpecRaw, &b.SectionSpec); err != nil {
+			return fmt.Errorf("decode submission base section_spec: %w", err)
+		}
+	}
+	b.IsDefaultFor = []string(b.IsDefaultForRaw)
+	if b.IsDefaultFor == nil {
+		b.IsDefaultFor = []string{}
+	}
+	return nil
+}

internal/services/submission_base_service_test.go

@@ -0,0 +1,99 @@
+package services
+
+// Unit tests for Composer base helpers — pure functions, no DB
+// dependency (t-paliad-313 Slice A).
+
+import "testing"
+
+func TestFamilyOfCode(t *testing.T) {
+	cases := []struct {
+		in   string
+		want string
+	}{
+		// canonical four-segment codes → first three segments
+		{"de.inf.lg.erwidg", "de.inf.lg"},
+		{"de.inf.lg.klage", "de.inf.lg"},
+		{"de.inf.olg.berufung", "de.inf.olg"},
+		{"upc.inf.cfi.soc", "upc.inf.cfi"},
+		{"upc.inf.cfi.sod", "upc.inf.cfi"},
+		{"upc.apl.cost.leave_app", "upc.apl.cost"},
+		{"epa.opp.opd.einspruch", "epa.opp.opd"},
+		// five-segment codes (rarely used in the corpus today) → still
+		// truncate to three
+		{"upc.inf.cfi.appeal_spawn.followup", "upc.inf.cfi"},
+		// shorter codes pass through unchanged
+		{"de.inf.lg", "de.inf.lg"},
+		{"de.inf", "de.inf"},
+		{"de", "de"},
+		// empty stays empty
+		{"", ""},
+	}
+	for _, tc := range cases {
+		t.Run(tc.in, func(t *testing.T) {
+			if got := familyOfCode(tc.in); got != tc.want {
+				t.Errorf("familyOfCode(%q) = %q; want %q", tc.in, got, tc.want)
+			}
+		})
+	}
+}
+
+func TestBaseSectionSpec_DecodeShape(t *testing.T) {
+	// The default seed in mig 146 emits a JSON document the service
+	// must decode round-trip; this golden pins the exact field shape
+	// the editor expects.
+	raw := []byte(`{
+		"version": 1,
+		"stylemap": {
+			"paragraph": "HLpat-Body-B0",
+			"heading_1": "HLpat-Heading-H1",
+			"heading_2": "HLpat-Heading-H2",
+			"heading_3": "HLpat-Heading-H3",
+			"list_bullet": "HLpat-Body-B0",
+			"list_numbered": "HLpat-Body-B0",
+			"blockquote": "HLpat-Body-B1"
+		},
+		"defaults": [
+			{"section_key":"letterhead","kind":"prose","order_index":1,"label_de":"Briefkopf","label_en":"Letterhead","included":true,"seed_md_de":"hi","seed_md_en":"hi"},
+			{"section_key":"requests","kind":"requests","order_index":4,"label_de":"Anträge","label_en":"Requests","included":true,"seed_md_de":"","seed_md_en":""}
+		]
+	}`)
+	b := SubmissionBase{SectionSpecRaw: raw}
+	if err := b.decode(); err != nil {
+		t.Fatalf("decode: %v", err)
+	}
+	if b.SectionSpec.Version != 1 {
+		t.Errorf("Version = %d; want 1", b.SectionSpec.Version)
+	}
+	if got := b.SectionSpec.Stylemap["heading_1"]; got != "HLpat-Heading-H1" {
+		t.Errorf("Stylemap[heading_1] = %q; want HLpat-Heading-H1", got)
+	}
+	if len(b.SectionSpec.Defaults) != 2 {
+		t.Fatalf("Defaults len = %d; want 2", len(b.SectionSpec.Defaults))
+	}
+	first := b.SectionSpec.Defaults[0]
+	if first.SectionKey != "letterhead" || first.Kind != "prose" || first.OrderIndex != 1 {
+		t.Errorf("Defaults[0] = %+v; want letterhead/prose/1", first)
+	}
+	if first.SeedMDDE != "hi" || first.SeedMDEN != "hi" {
+		t.Errorf("Defaults[0] seed_md_* = %q/%q; want hi/hi", first.SeedMDDE, first.SeedMDEN)
+	}
+	second := b.SectionSpec.Defaults[1]
+	if second.SectionKey != "requests" || second.Kind != "requests" || second.OrderIndex != 4 {
+		t.Errorf("Defaults[1] = %+v; want requests/requests/4", second)
+	}
+}
+
+func TestBaseSectionSpec_EmptyDecode(t *testing.T) {
+	// A bare row (SectionSpecRaw == nil) decodes cleanly into the
+	// zero value — no panic, no garbage.
+	b := SubmissionBase{}
+	if err := b.decode(); err != nil {
+		t.Fatalf("decode empty: %v", err)
+	}
+	if b.SectionSpec.Version != 0 || len(b.SectionSpec.Defaults) != 0 {
+		t.Errorf("expected zero SectionSpec on empty raw; got %+v", b.SectionSpec)
+	}
+	if b.IsDefaultFor == nil {
+		t.Errorf("IsDefaultFor must be non-nil (empty slice) after decode; got nil")
+	}
+}

internal/services/submission_building_block_service.go

@@ -0,0 +1,629 @@
+package services
+
+// Composer building-block library service — t-paliad-315 Slice C
+// (design doc docs/design-submission-generator-v2-2026-05-26.md §8 +
+// §4.4).
+//
+// Per the Q2 ratification (m, 2026-05-26): building blocks are plain
+// text paste sources. The library row is the source; the lawyer's
+// section row is the destination. After paste, the section row has
+// no link back to the library — the prose belongs to the section.
+//
+// Per the Q9 ratification: four visibility tiers — private / team /
+// firm / global. The DB-side RLS policy (mig 149) handles the
+// "private rows only the author sees" coarse gate. This service
+// applies the fine-grained tier predicate at query time, so the
+// picker on the section editor only shows blocks the caller actually
+// has reach to.
+//
+// Admin mutations are gated at the handler layer (adminGate). The
+// service exposes Create + Update + SoftDelete + RestoreVersion which
+// all assume the caller has already passed the admin check.
+// Append-only audit history (_admin_versions) is retained at 20 rows
+// per block, GCed in the same transaction as each Save.
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+)
+
+// BuildingBlock mirrors a row in paliad.submission_building_blocks.
+type BuildingBlock struct {
+	ID               uuid.UUID  `db:"id"                  json:"id"`
+	Slug             string     `db:"slug"                json:"slug"`
+	Firm             *string    `db:"firm"                json:"firm,omitempty"`
+	SectionKey       string     `db:"section_key"         json:"section_key"`
+	ProceedingFamily *string    `db:"proceeding_family"   json:"proceeding_family,omitempty"`
+	TitleDE          string     `db:"title_de"            json:"title_de"`
+	TitleEN          string     `db:"title_en"            json:"title_en"`
+	DescriptionDE    *string    `db:"description_de"      json:"description_de,omitempty"`
+	DescriptionEN    *string    `db:"description_en"      json:"description_en,omitempty"`
+	ContentMDDE      string     `db:"content_md_de"       json:"content_md_de"`
+	ContentMDEN      string     `db:"content_md_en"       json:"content_md_en"`
+	AuthorID         *uuid.UUID `db:"author_id"           json:"author_id,omitempty"`
+	Visibility       string     `db:"visibility"          json:"visibility"`
+	IsPublished      bool       `db:"is_published"        json:"is_published"`
+	CreatedAt        time.Time  `db:"created_at"          json:"created_at"`
+	UpdatedAt        time.Time  `db:"updated_at"          json:"updated_at"`
+	DeletedAt        *time.Time `db:"deleted_at"          json:"-"`
+}
+
+// BuildingBlockVersion is one row from the admin-only audit history.
+type BuildingBlockVersion struct {
+	ID              uuid.UUID  `db:"id"                  json:"id"`
+	BuildingBlockID uuid.UUID  `db:"building_block_id"   json:"building_block_id"`
+	ContentMDDE     string     `db:"content_md_de"       json:"content_md_de"`
+	ContentMDEN     string     `db:"content_md_en"       json:"content_md_en"`
+	TitleDE         string     `db:"title_de"            json:"title_de"`
+	TitleEN         string     `db:"title_en"            json:"title_en"`
+	EditedBy        *uuid.UUID `db:"edited_by"           json:"edited_by,omitempty"`
+	Note            *string    `db:"note"                json:"note,omitempty"`
+	CreatedAt       time.Time  `db:"created_at"          json:"created_at"`
+}
+
+// BuildingBlockService handles the library + admin audit history.
+type BuildingBlockService struct {
+	db   *sqlx.DB
+	firm string
+}
+
+// NewBuildingBlockService wires the service. firm is branding.Name —
+// captured at construction time and used to apply the firm-tier
+// filter on List/Get calls.
+func NewBuildingBlockService(db *sqlx.DB, firm string) *BuildingBlockService {
+	return &BuildingBlockService{db: db, firm: firm}
+}
+
+const (
+	// VisPrivate / Team / Firm / Global — the 4 tiers per Q9.
+	VisPrivate = "private"
+	VisTeam    = "team"
+	VisFirm    = "firm"
+	VisGlobal  = "global"
+
+	// Retention horizon for the admin audit history per block.
+	buildingBlockVersionRetention = 20
+)
+
+// ErrBuildingBlockNotFound is the sentinel for "no block with that id
+// visible to this user". Maps to 404 at the handler layer.
+var ErrBuildingBlockNotFound = errors.New("submission building block: not found")
+
+// ErrBuildingBlockInvalidVisibility is the sentinel for a Create /
+// Update with an unknown tier value.
+var ErrBuildingBlockInvalidVisibility = errors.New("submission building block: invalid visibility")
+
+const buildingBlockColumns = `id, slug, firm, section_key, proceeding_family,
+                              title_de, title_en, description_de, description_en,
+                              content_md_de, content_md_en,
+                              author_id, visibility, is_published,
+                              created_at, updated_at, deleted_at`
+
+// BlockListFilter narrows the picker query. All fields optional. Returns
+// only published, non-deleted rows the caller has tier reach to.
+type BlockListFilter struct {
+	// SectionKey filters to blocks bound to one section (the picker
+	// uses this to restrict "facts" blocks to facts sections, etc.).
+	// Empty string = no filter.
+	SectionKey string
+	// ProceedingFamily filters to blocks tagged for one family OR
+	// untagged (proceeding_family IS NULL = "any family"). Empty
+	// string = no filter.
+	ProceedingFamily string
+	// Search free-text query against title + description + content.
+	// Empty string = no filter.
+	Search string
+	// Limit caps the result count (0 = default 50).
+	Limit int
+}
+
+// ListVisible returns blocks the caller can see, after the tier
+// predicate is applied. Ordered by updated_at DESC. The DB-side
+// SELECT policy already drops soft-deleted rows + private-other-author
+// rows; this query additionally honours the picker filter + the
+// is_published gate + the firm + team predicates.
+func (s *BuildingBlockService) ListVisible(ctx context.Context, userID uuid.UUID, filter BlockListFilter) ([]BuildingBlock, error) {
+	limit := filter.Limit
+	if limit <= 0 {
+		limit = 50
+	}
+
+	q := `SELECT ` + buildingBlockColumns + `
+	      FROM paliad.submission_building_blocks
+	      WHERE deleted_at IS NULL
+	        AND is_published = true
+	        AND (
+	          visibility = 'global'
+	          OR visibility = 'private' AND author_id = $1
+	          OR visibility = 'firm' AND (firm IS NULL OR firm = $2)
+	          OR visibility = 'team' AND EXISTS (
+	              SELECT 1 FROM paliad.project_teams pt1
+	              JOIN paliad.project_teams pt2 ON pt1.project_id = pt2.project_id
+	              WHERE pt1.user_id = author_id AND pt2.user_id = $1
+	          )
+	        )`
+	args := []any{userID, s.firm}
+	idx := 3
+
+	if filter.SectionKey != "" {
+		q += fmt.Sprintf(" AND section_key = $%d", idx)
+		args = append(args, filter.SectionKey)
+		idx++
+	}
+	if filter.ProceedingFamily != "" {
+		q += fmt.Sprintf(" AND (proceeding_family IS NULL OR proceeding_family = $%d)", idx)
+		args = append(args, filter.ProceedingFamily)
+		idx++
+	}
+	if filter.Search != "" {
+		pattern := "%" + strings.ToLower(filter.Search) + "%"
+		q += fmt.Sprintf(" AND (LOWER(title_de) LIKE $%d OR LOWER(title_en) LIKE $%d OR LOWER(COALESCE(description_de,'')) LIKE $%d OR LOWER(COALESCE(description_en,'')) LIKE $%d OR LOWER(content_md_de) LIKE $%d OR LOWER(content_md_en) LIKE $%d)",
+			idx, idx, idx, idx, idx, idx)
+		args = append(args, pattern)
+		idx++
+	}
+	q += fmt.Sprintf(" ORDER BY updated_at DESC LIMIT $%d", idx)
+	args = append(args, limit)
+
+	var rows []BuildingBlock
+	err := s.db.SelectContext(ctx, &rows, q, args...)
+	if err != nil {
+		return nil, fmt.Errorf("list building blocks: %w", err)
+	}
+	return rows, nil
+}
+
+// ListAllForAdmin returns every non-deleted row regardless of tier.
+// Handler-side adminGate is the access gate.
+func (s *BuildingBlockService) ListAllForAdmin(ctx context.Context) ([]BuildingBlock, error) {
+	var rows []BuildingBlock
+	err := s.db.SelectContext(ctx, &rows,
+		`SELECT `+buildingBlockColumns+`
+		   FROM paliad.submission_building_blocks
+		  WHERE deleted_at IS NULL
+		  ORDER BY updated_at DESC`)
+	if err != nil {
+		return nil, fmt.Errorf("admin list building blocks: %w", err)
+	}
+	return rows, nil
+}
+
+// GetVisible fetches a block by id, applying the same tier predicate
+// as ListVisible. ErrBuildingBlockNotFound when the row exists but
+// the caller has no tier reach (handler maps to 404).
+func (s *BuildingBlockService) GetVisible(ctx context.Context, userID, blockID uuid.UUID) (*BuildingBlock, error) {
+	var b BuildingBlock
+	err := s.db.GetContext(ctx, &b,
+		`SELECT `+buildingBlockColumns+`
+		   FROM paliad.submission_building_blocks
+		  WHERE id = $1
+		    AND deleted_at IS NULL
+		    AND is_published = true
+		    AND (
+		      visibility = 'global'
+		      OR visibility = 'private' AND author_id = $2
+		      OR visibility = 'firm' AND (firm IS NULL OR firm = $3)
+		      OR visibility = 'team' AND EXISTS (
+		          SELECT 1 FROM paliad.project_teams pt1
+		          JOIN paliad.project_teams pt2 ON pt1.project_id = pt2.project_id
+		          WHERE pt1.user_id = author_id AND pt2.user_id = $2
+		      )
+		    )`,
+		blockID, userID, s.firm)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrBuildingBlockNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("get building block: %w", err)
+	}
+	return &b, nil
+}
+
+// GetForAdmin fetches a block by id with no tier filter. adminGate at
+// the handler is the access gate.
+func (s *BuildingBlockService) GetForAdmin(ctx context.Context, blockID uuid.UUID) (*BuildingBlock, error) {
+	var b BuildingBlock
+	err := s.db.GetContext(ctx, &b,
+		`SELECT `+buildingBlockColumns+`
+		   FROM paliad.submission_building_blocks
+		  WHERE id = $1 AND deleted_at IS NULL`,
+		blockID)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrBuildingBlockNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("admin get building block: %w", err)
+	}
+	return &b, nil
+}
+
+// CreateInput carries the fields needed to insert a new block. Admin
+// path only (Slice C); user-authored private blocks are a later
+// feature.
+type CreateInput struct {
+	Slug             string
+	Firm             *string
+	SectionKey       string
+	ProceedingFamily *string
+	TitleDE          string
+	TitleEN          string
+	DescriptionDE    *string
+	DescriptionEN    *string
+	ContentMDDE      string
+	ContentMDEN      string
+	Visibility       string
+	IsPublished      bool
+}
+
+// Create inserts a new block and seeds the first audit-history row.
+// editorID is the admin's uuid; recorded in _admin_versions.edited_by.
+func (s *BuildingBlockService) Create(ctx context.Context, editorID uuid.UUID, in CreateInput) (*BuildingBlock, error) {
+	if !validVisibility(in.Visibility) {
+		return nil, ErrBuildingBlockInvalidVisibility
+	}
+	in.Slug = strings.TrimSpace(in.Slug)
+	in.SectionKey = strings.TrimSpace(in.SectionKey)
+	in.TitleDE = strings.TrimSpace(in.TitleDE)
+	in.TitleEN = strings.TrimSpace(in.TitleEN)
+	if in.Slug == "" || in.SectionKey == "" || in.TitleDE == "" || in.TitleEN == "" {
+		return nil, ErrInvalidInput
+	}
+
+	tx, err := s.db.BeginTxx(ctx, nil)
+	if err != nil {
+		return nil, fmt.Errorf("create building block tx: %w", err)
+	}
+	committed := false
+	defer func() {
+		if !committed {
+			_ = tx.Rollback()
+		}
+	}()
+
+	var b BuildingBlock
+	err = tx.GetContext(ctx, &b,
+		`INSERT INTO paliad.submission_building_blocks
+		     (slug, firm, section_key, proceeding_family,
+		      title_de, title_en, description_de, description_en,
+		      content_md_de, content_md_en, author_id, visibility, is_published)
+		 VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13)
+		 RETURNING `+buildingBlockColumns,
+		in.Slug, in.Firm, in.SectionKey, in.ProceedingFamily,
+		in.TitleDE, in.TitleEN, in.DescriptionDE, in.DescriptionEN,
+		in.ContentMDDE, in.ContentMDEN, editorID, in.Visibility, in.IsPublished)
+	if err != nil {
+		return nil, fmt.Errorf("insert building block: %w", err)
+	}
+	if err := s.appendVersionTx(ctx, tx, b.ID, editorID, &b, "create"); err != nil {
+		return nil, err
+	}
+	if err := tx.Commit(); err != nil {
+		return nil, fmt.Errorf("commit create building block: %w", err)
+	}
+	committed = true
+	return &b, nil
+}
+
+// UpdatePatch carries the optional fields for an Update call.
+type UpdatePatch struct {
+	Slug             *string
+	Firm             **string // **string for "set to null" semantics
+	SectionKey       *string
+	ProceedingFamily **string
+	TitleDE          *string
+	TitleEN          *string
+	DescriptionDE    **string
+	DescriptionEN    **string
+	ContentMDDE      *string
+	ContentMDEN      *string
+	Visibility       *string
+	IsPublished      *bool
+	Note             *string // free-form note that lands in _admin_versions
+}
+
+// Update applies a patch. Appends an audit-history row; GCs to the
+// retention=20 horizon in the same tx so old versions don't pile up.
+func (s *BuildingBlockService) Update(ctx context.Context, editorID, blockID uuid.UUID, patch UpdatePatch) (*BuildingBlock, error) {
+	if patch.Visibility != nil && !validVisibility(*patch.Visibility) {
+		return nil, ErrBuildingBlockInvalidVisibility
+	}
+
+	tx, err := s.db.BeginTxx(ctx, nil)
+	if err != nil {
+		return nil, fmt.Errorf("update building block tx: %w", err)
+	}
+	committed := false
+	defer func() {
+		if !committed {
+			_ = tx.Rollback()
+		}
+	}()
+
+	setParts := []string{}
+	args := []any{}
+	idx := 1
+
+	addText := func(col string, p *string) {
+		if p == nil {
+			return
+		}
+		setParts = append(setParts, fmt.Sprintf("%s = $%d", col, idx))
+		args = append(args, *p)
+		idx++
+	}
+	addBool := func(col string, p *bool) {
+		if p == nil {
+			return
+		}
+		setParts = append(setParts, fmt.Sprintf("%s = $%d", col, idx))
+		args = append(args, *p)
+		idx++
+	}
+	addNullable := func(col string, p **string) {
+		if p == nil {
+			return
+		}
+		setParts = append(setParts, fmt.Sprintf("%s = $%d", col, idx))
+		args = append(args, *p)
+		idx++
+	}
+
+	addText("slug", patch.Slug)
+	addNullable("firm", patch.Firm)
+	addText("section_key", patch.SectionKey)
+	addNullable("proceeding_family", patch.ProceedingFamily)
+	addText("title_de", patch.TitleDE)
+	addText("title_en", patch.TitleEN)
+	addNullable("description_de", patch.DescriptionDE)
+	addNullable("description_en", patch.DescriptionEN)
+	addText("content_md_de", patch.ContentMDDE)
+	addText("content_md_en", patch.ContentMDEN)
+	addText("visibility", patch.Visibility)
+	addBool("is_published", patch.IsPublished)
+
+	if len(setParts) == 0 {
+		// No-op patch — still append a version with the user's note if
+		// supplied. Otherwise just return current row.
+		current, err := s.GetForAdmin(ctx, blockID)
+		if err != nil {
+			return nil, err
+		}
+		if patch.Note != nil && strings.TrimSpace(*patch.Note) != "" {
+			if err := s.appendVersionTx(ctx, tx, blockID, editorID, current, *patch.Note); err != nil {
+				return nil, err
+			}
+		}
+		if err := tx.Commit(); err != nil {
+			return nil, fmt.Errorf("commit no-op update building block: %w", err)
+		}
+		committed = true
+		return current, nil
+	}
+
+	args = append(args, blockID)
+	q := fmt.Sprintf(
+		`UPDATE paliad.submission_building_blocks
+		    SET %s
+		  WHERE id = $%d AND deleted_at IS NULL
+		  RETURNING `+buildingBlockColumns,
+		strings.Join(setParts, ", "), idx,
+	)
+	var b BuildingBlock
+	err = tx.GetContext(ctx, &b, q, args...)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrBuildingBlockNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("update building block: %w", err)
+	}
+
+	note := ""
+	if patch.Note != nil {
+		note = *patch.Note
+	}
+	if note == "" {
+		note = "update"
+	}
+	if err := s.appendVersionTx(ctx, tx, blockID, editorID, &b, note); err != nil {
+		return nil, err
+	}
+	if err := tx.Commit(); err != nil {
+		return nil, fmt.Errorf("commit update building block: %w", err)
+	}
+	committed = true
+	return &b, nil
+}
+
+// SoftDelete marks a block deleted. RLS hides deleted rows; the
+// admin can still see them via GetForAdmin if the row is referenced
+// by audit history.
+func (s *BuildingBlockService) SoftDelete(ctx context.Context, editorID, blockID uuid.UUID) error {
+	tx, err := s.db.BeginTxx(ctx, nil)
+	if err != nil {
+		return fmt.Errorf("soft delete tx: %w", err)
+	}
+	committed := false
+	defer func() {
+		if !committed {
+			_ = tx.Rollback()
+		}
+	}()
+	var b BuildingBlock
+	err = tx.GetContext(ctx, &b,
+		`UPDATE paliad.submission_building_blocks
+		    SET deleted_at = now()
+		  WHERE id = $1 AND deleted_at IS NULL
+		  RETURNING `+buildingBlockColumns,
+		blockID)
+	if errors.Is(err, sql.ErrNoRows) {
+		return ErrBuildingBlockNotFound
+	}
+	if err != nil {
+		return fmt.Errorf("soft delete: %w", err)
+	}
+	if err := s.appendVersionTx(ctx, tx, blockID, editorID, &b, "delete"); err != nil {
+		return err
+	}
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf("commit soft delete: %w", err)
+	}
+	committed = true
+	return nil
+}
+
+// ListVersions returns the audit history for a block (most recent
+// first), capped at retention. Admin path only.
+func (s *BuildingBlockService) ListVersions(ctx context.Context, blockID uuid.UUID) ([]BuildingBlockVersion, error) {
+	var rows []BuildingBlockVersion
+	err := s.db.SelectContext(ctx, &rows,
+		`SELECT id, building_block_id, content_md_de, content_md_en,
+		        title_de, title_en, edited_by, note, created_at
+		   FROM paliad.submission_building_block_admin_versions
+		  WHERE building_block_id = $1
+		  ORDER BY created_at DESC
+		  LIMIT $2`,
+		blockID, buildingBlockVersionRetention)
+	if err != nil {
+		return nil, fmt.Errorf("list building block versions: %w", err)
+	}
+	return rows, nil
+}
+
+// RestoreVersion overwrites the block's current content + titles with
+// the named version's snapshot. Appends a new audit row noting the
+// restore. Admin path only.
+func (s *BuildingBlockService) RestoreVersion(ctx context.Context, editorID, blockID, versionID uuid.UUID) (*BuildingBlock, error) {
+	tx, err := s.db.BeginTxx(ctx, nil)
+	if err != nil {
+		return nil, fmt.Errorf("restore version tx: %w", err)
+	}
+	committed := false
+	defer func() {
+		if !committed {
+			_ = tx.Rollback()
+		}
+	}()
+
+	var v BuildingBlockVersion
+	err = tx.GetContext(ctx, &v,
+		`SELECT id, building_block_id, content_md_de, content_md_en,
+		        title_de, title_en, edited_by, note, created_at
+		   FROM paliad.submission_building_block_admin_versions
+		  WHERE id = $1 AND building_block_id = $2`,
+		versionID, blockID)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrBuildingBlockNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("fetch version: %w", err)
+	}
+
+	var b BuildingBlock
+	err = tx.GetContext(ctx, &b,
+		`UPDATE paliad.submission_building_blocks
+		    SET content_md_de = $1, content_md_en = $2,
+		        title_de = $3, title_en = $4
+		  WHERE id = $5 AND deleted_at IS NULL
+		  RETURNING `+buildingBlockColumns,
+		v.ContentMDDE, v.ContentMDEN, v.TitleDE, v.TitleEN, blockID)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrBuildingBlockNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("restore update: %w", err)
+	}
+
+	note := fmt.Sprintf("restore from %s", versionID.String())
+	if err := s.appendVersionTx(ctx, tx, blockID, editorID, &b, note); err != nil {
+		return nil, err
+	}
+	if err := tx.Commit(); err != nil {
+		return nil, fmt.Errorf("commit restore: %w", err)
+	}
+	committed = true
+	return &b, nil
+}
+
+// appendVersionTx inserts an audit row + GCs to the retention horizon.
+// Runs inside the caller's transaction so a failure rolls back the
+// associated Create / Update / Delete / Restore.
+func (s *BuildingBlockService) appendVersionTx(ctx context.Context, tx *sqlx.Tx, blockID, editorID uuid.UUID, b *BuildingBlock, note string) error {
+	_, err := tx.ExecContext(ctx,
+		`INSERT INTO paliad.submission_building_block_admin_versions
+		     (building_block_id, content_md_de, content_md_en,
+		      title_de, title_en, edited_by, note)
+		 VALUES ($1, $2, $3, $4, $5, $6, $7)`,
+		blockID, b.ContentMDDE, b.ContentMDEN, b.TitleDE, b.TitleEN, editorID, note)
+	if err != nil {
+		return fmt.Errorf("append version: %w", err)
+	}
+	// GC: keep only the most recent N versions per block.
+	_, err = tx.ExecContext(ctx,
+		`DELETE FROM paliad.submission_building_block_admin_versions
+		  WHERE id IN (
+		    SELECT id FROM paliad.submission_building_block_admin_versions
+		     WHERE building_block_id = $1
+		     ORDER BY created_at DESC
+		     OFFSET $2
+		  )`,
+		blockID, buildingBlockVersionRetention)
+	if err != nil {
+		return fmt.Errorf("gc version history: %w", err)
+	}
+	return nil
+}
+
+// InsertIntoSection clones a block's content_md_<lang> into the named
+// section by appending at the end (with a paragraph break separator).
+// Per Q2: no lineage stamped on the section. The returned
+// SubmissionSection carries the updated content.
+//
+// The handler enforces draft ownership before calling this; the
+// service does the visibility check on the block itself and the
+// SectionService.Get + Update sequence inside one transaction so an
+// in-flight failure rolls back cleanly.
+func (s *BuildingBlockService) InsertIntoSection(ctx context.Context, userID, blockID, sectionID uuid.UUID, sections *SectionService) (*SubmissionSection, error) {
+	block, err := s.GetVisible(ctx, userID, blockID)
+	if err != nil {
+		return nil, err
+	}
+	sec, err := sections.Get(ctx, sectionID)
+	if err != nil {
+		return nil, err
+	}
+
+	// Determine which lang column to splice into based on the section
+	// row's existing content + the block's content. We splice both
+	// lang columns so the section is bilingually current — the
+	// lawyer's draft language picker still drives which one renders.
+	newDE := appendBlockContent(sec.ContentMDDE, block.ContentMDDE)
+	newEN := appendBlockContent(sec.ContentMDEN, block.ContentMDEN)
+
+	patch := SectionPatch{ContentMDDE: &newDE, ContentMDEN: &newEN}
+	return sections.Update(ctx, sectionID, patch)
+}
+
+func appendBlockContent(existing, addition string) string {
+	if strings.TrimSpace(existing) == "" {
+		return addition
+	}
+	if strings.TrimSpace(addition) == "" {
+		return existing
+	}
+	return strings.TrimRight(existing, "\n") + "\n\n" + addition
+}
+
+func validVisibility(v string) bool {
+	switch v {
+	case VisPrivate, VisTeam, VisFirm, VisGlobal:
+		return true
+	}
+	return false
+}

internal/services/submission_building_block_service_test.go

@@ -0,0 +1,60 @@
+package services
+
+// Unit tests for BuildingBlockService helpers — pure functions, no DB
+// dependency (t-paliad-315 Slice C).
+
+import "testing"
+
+func TestValidVisibility(t *testing.T) {
+	cases := []struct {
+		in    string
+		valid bool
+	}{
+		{"private", true},
+		{"team", true},
+		{"firm", true},
+		{"global", true},
+		{"PRIVATE", false}, // case-sensitive
+		{"", false},
+		{"public", false},
+		{"all", false},
+	}
+	for _, tc := range cases {
+		t.Run(tc.in, func(t *testing.T) {
+			if got := validVisibility(tc.in); got != tc.valid {
+				t.Errorf("validVisibility(%q) = %v; want %v", tc.in, got, tc.valid)
+			}
+		})
+	}
+}
+
+func TestAppendBlockContent(t *testing.T) {
+	cases := []struct {
+		existing string
+		addition string
+		want     string
+	}{
+		{"", "hello", "hello"},
+		{"existing", "", "existing"},
+		{"", "", ""},
+		{"existing", "addition", "existing\n\naddition"},
+		{"existing\n", "addition", "existing\n\naddition"},
+		{"existing\n\n\n", "addition", "existing\n\naddition"},
+		{"   ", "addition", "addition"}, // whitespace-only existing counts as empty
+		{"existing", "   ", "existing"}, // whitespace-only addition counts as empty
+	}
+	for _, tc := range cases {
+		if got := appendBlockContent(tc.existing, tc.addition); got != tc.want {
+			t.Errorf("appendBlockContent(%q,%q) = %q; want %q", tc.existing, tc.addition, got, tc.want)
+		}
+	}
+}
+
+func TestBuildingBlockVisibilityConstants(t *testing.T) {
+	// Pin the constants so a typo somewhere doesn't silently flip a
+	// tier name. The DB CHECK constraint and the RLS predicate both
+	// hard-code these literals.
+	if VisPrivate != "private" || VisTeam != "team" || VisFirm != "firm" || VisGlobal != "global" {
+		t.Errorf("visibility constants drifted: %q/%q/%q/%q", VisPrivate, VisTeam, VisFirm, VisGlobal)
+	}
+}

internal/services/submission_compose.go

@@ -0,0 +1,469 @@
+package services
+
+// Composer render pipeline — t-paliad-313 Slice B (design doc §9.1 +
+// §9.2). Assembles a base .docx and a draft's section rows into a
+// merged .docx ready for export.
+//
+// Pipeline (high-level):
+//
+//  1. ConvertDotmToDocx pre-pass on the base bytes (idempotent on .docx).
+//  2. Locate `word/document.xml` inside the zip; pull the body XML.
+//  3. For each section in the draft (order_index ASC, included=true):
+//     render content_md_<lang> → OOXML via RenderMarkdownToOOXML using
+//     base.section_spec.stylemap.paragraph.
+//  4. Splice the rendered OOXML into the base body. Two splice modes:
+//     - Anchor mode: when the body carries `{{#section:KEY}}` /
+//       `{{/section:KEY}}` marker pairs, replace the slot's content
+//       (including the anchor paragraphs themselves) with the rendered
+//       section.
+//     - Append mode: when no anchor pair is found for a section, the
+//       rendered OOXML appends at the end of the body, just before any
+//       `<w:sectPr>` element. Sections with `included=false` are
+//       dropped silently.
+//  5. Strip any leftover unmatched anchor paragraphs.
+//  6. Re-pack the document.xml into the zip, leaving every other part
+//     untouched.
+//  7. Run the v1 SubmissionRenderer placeholder pass over the assembly
+//     so `{{path}}` placeholders inside section content (and inside
+//     the base's untouched chrome) get substituted by the merged bag.
+//     Cross-run merge in pass 2 handles autocorrect-fragmented
+//     placeholders the same as v1.
+//
+// Result: a fully-merged .docx. No new third-party Go dep — reuses
+// archive/zip + the existing SubmissionRenderer.
+
+import (
+	"archive/zip"
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"regexp"
+	"sort"
+	"strings"
+	"time"
+)
+
+// SubmissionComposer assembles base + sections into a final .docx.
+// Stateless; safe for concurrent use.
+type SubmissionComposer struct {
+	renderer *SubmissionRenderer
+}
+
+// NewSubmissionComposer wires the composer. The renderer is required —
+// a nil renderer is a programmer error and the composer panics at
+// construction.
+func NewSubmissionComposer(renderer *SubmissionRenderer) *SubmissionComposer {
+	if renderer == nil {
+		panic("submission composer: renderer required")
+	}
+	return &SubmissionComposer{renderer: renderer}
+}
+
+// ComposeOptions carries the per-call composition inputs.
+type ComposeOptions struct {
+	// Sections are the draft's section rows in display order. The
+	// composer renders included sections; excluded rows are dropped.
+	// Caller is responsible for visibility — by the time the composer
+	// runs, the section rows have already been gated through
+	// SubmissionDraftService.Get + can_see_project.
+	Sections []SubmissionSection
+
+	// Base supplies the document chrome (.docx body host) plus the
+	// stylemap for the MD walker. Must not be nil.
+	Base *SubmissionBase
+
+	// BaseBytes is the raw .docx bytes for the base. Typically fetched
+	// from Gitea via the existing template cache.
+	BaseBytes []byte
+
+	// Lang ('de' or 'en') selects which content_md_* column the
+	// composer reads per section. Defaults to 'de' if empty.
+	Lang string
+
+	// Vars is the merged placeholder bag the v1 renderer pass
+	// substitutes after the composer assembly. Passed straight through
+	// to SubmissionRenderer.Render.
+	Vars PlaceholderMap
+
+	// Missing translates an unbound placeholder key into the marker
+	// the lawyer sees in Word. Passed straight to the renderer.
+	Missing MissingPlaceholderFn
+}
+
+// Compose runs the full pipeline and returns the merged .docx bytes.
+func (c *SubmissionComposer) Compose(ctx context.Context, opts ComposeOptions) ([]byte, error) {
+	if opts.Base == nil {
+		return nil, fmt.Errorf("submission compose: base required")
+	}
+	_ = ctx // reserved for cancellation propagation in later slices
+	sections := opts.Sections
+
+	// Pre-pass: strip macros so the base reads as a plain .docx zip.
+	cleanBytes, err := ConvertDotmToDocx(opts.BaseBytes)
+	if err != nil {
+		return nil, fmt.Errorf("submission compose: convert base: %w", err)
+	}
+
+	// Locate + extract word/document.xml so we can splice in-place.
+	documentXML, otherParts, err := splitBaseZip(cleanBytes)
+	if err != nil {
+		return nil, err
+	}
+
+	// Build the rendered-section map: section_key → OOXML span.
+	style := opts.Base.SectionSpec.Stylemap["paragraph"]
+	rendered := make(map[string]string, len(sections))
+	keptSections := make([]SubmissionSection, 0, len(sections))
+	for _, sec := range sections {
+		if !sec.Included {
+			continue
+		}
+		md := sec.ContentMDDE
+		if strings.EqualFold(opts.Lang, "en") {
+			md = sec.ContentMDEN
+		}
+		rendered[sec.SectionKey] = RenderMarkdownToOOXML(md, style)
+		keptSections = append(keptSections, sec)
+	}
+	// Stable order — already sorted ascending by ListForDraft, but
+	// belt-and-braces in case the caller swaps the ordering policy
+	// later.
+	sort.SliceStable(keptSections, func(i, j int) bool {
+		return keptSections[i].OrderIndex < keptSections[j].OrderIndex
+	})
+
+	assembledBody := spliceSections(documentXML, rendered, keptSections, sections)
+
+	// Re-pack into a zip with the assembled document.xml. All other
+	// parts (styles, fonts, headers, footers, theme, settings) pass
+	// through bit-for-bit at their original mtime + compression.
+	repacked, err := repackBaseZip(otherParts, assembledBody)
+	if err != nil {
+		return nil, err
+	}
+
+	// Final pass: substitute placeholders against the merged bag. The
+	// existing renderer handles cross-run fragmentation, the `{{rule.X}}`
+	// alias contract, and the missing-marker emission. Reusing it
+	// guarantees v1's placeholder grammar stays intact inside section
+	// content + base chrome.
+	merged, err := c.renderer.Render(repacked, opts.Vars, opts.Missing)
+	if err != nil {
+		return nil, fmt.Errorf("submission compose: placeholder pass: %w", err)
+	}
+	return merged, nil
+}
+
+// ─────────────────────────────────────────────────────────────────────
+// Section splicing
+// ─────────────────────────────────────────────────────────────────────
+
+// Anchor markers as they appear inside a <w:t> text node. We don't
+// need a full XML parse — finding the marker text inside the body is
+// sufficient because:
+//   - {{ and }} are never legitimate document content (placeholders
+//     follow the same convention everywhere else in paliad).
+//   - The anchor key grammar [A-Za-z0-9_]+ rules out any HTML/XML
+//     special characters.
+//   - Each anchor lives in exactly one <w:t>...<w:t>, which lives in
+//     exactly one <w:r>...</w:r>, which lives in exactly one
+//     <w:p>...</w:p>. We expand from the marker outward to find the
+//     enclosing <w:p> span and drop the entire paragraph as part of
+//     the splice.
+//
+// RE2 has no lookahead, so the "find enclosing <w:p>" logic is
+// implemented as manual byte-index search around the marker hit
+// (anchorParagraphSpan below) rather than a single regex pattern.
+
+const (
+	anchorOpenPrefix  = "{{#section:"
+	anchorClosePrefix = "{{/section:"
+	anchorSuffix      = "}}"
+)
+
+// anchorKeyRegex validates that the captured anchor key is a clean
+// identifier. Keys that include other characters (which can't actually
+// appear in our authored .docx) are treated as no match.
+var anchorKeyRegex = regexp.MustCompile(`^[A-Za-z0-9_]+$`)
+
+// anchorPair records the byte span of one matched anchor pair inside
+// the body — from the start of the opening anchor's <w:p> element
+// through the end of the closing anchor's </w:p>.
+type anchorPair struct {
+	key      string
+	openStart int // start of <w:p> for the opening anchor
+	closeEnd  int // index just past </w:p> for the closing anchor
+}
+
+// findAllAnchorPairs scans the body for matched open/close anchor
+// pairs. Unbalanced markers (open without close, or vice versa) are
+// dropped from the result. Returns pairs in body-order; each pair's
+// span is non-overlapping.
+func findAllAnchorPairs(body string) []anchorPair {
+	type marker struct {
+		key      string
+		paraStart int
+		paraEnd   int
+		isOpen   bool
+	}
+	var markers []marker
+
+	collect := func(prefix string, isOpen bool) {
+		offset := 0
+		for {
+			idx := strings.Index(body[offset:], prefix)
+			if idx < 0 {
+				return
+			}
+			start := offset + idx
+			suffixIdx := strings.Index(body[start+len(prefix):], anchorSuffix)
+			if suffixIdx < 0 {
+				return
+			}
+			key := body[start+len(prefix) : start+len(prefix)+suffixIdx]
+			if !anchorKeyRegex.MatchString(key) {
+				offset = start + len(prefix)
+				continue
+			}
+			markerEnd := start + len(prefix) + suffixIdx + len(anchorSuffix)
+			pStart, pEnd, ok := paragraphSpanAround(body, start, markerEnd)
+			if !ok {
+				offset = markerEnd
+				continue
+			}
+			markers = append(markers, marker{key: key, paraStart: pStart, paraEnd: pEnd, isOpen: isOpen})
+			offset = pEnd
+		}
+	}
+	collect(anchorOpenPrefix, true)
+	collect(anchorClosePrefix, false)
+
+	// Walk markers in body-order, matching each open with the next
+	// close that carries the same key.
+	sort.SliceStable(markers, func(i, j int) bool {
+		return markers[i].paraStart < markers[j].paraStart
+	})
+	var pairs []anchorPair
+	openStack := map[string]marker{}
+	for _, m := range markers {
+		if m.isOpen {
+			openStack[m.key] = m
+			continue
+		}
+		o, ok := openStack[m.key]
+		if !ok {
+			continue
+		}
+		pairs = append(pairs, anchorPair{
+			key:       m.key,
+			openStart: o.paraStart,
+			closeEnd:  m.paraEnd,
+		})
+		delete(openStack, m.key)
+	}
+	return pairs
+}
+
+// paragraphSpanAround returns the byte span of the smallest `<w:p>...</w:p>`
+// element that fully contains the byte range [markerStart, markerEnd).
+// Returns false when the byte range doesn't sit inside a single
+// paragraph (which would mean the marker survived a cross-paragraph
+// edit — defensive guard, shouldn't happen in well-formed input).
+func paragraphSpanAround(body string, markerStart, markerEnd int) (int, int, bool) {
+	// Walk backwards to find the nearest unclosed <w:p ... > opening.
+	// Since <w:p> doesn't nest, the nearest <w:p before markerStart is
+	// the enclosing paragraph's opening tag.
+	pStart := -1
+	cursor := markerStart
+	for cursor > 0 {
+		idx := strings.LastIndex(body[:cursor], "<w:p")
+		if idx < 0 {
+			break
+		}
+		// Confirm this is a paragraph open, not a different
+		// w:p-prefixed tag (e.g. <w:pPr>).
+		if idx+4 <= len(body) {
+			after := body[idx+4]
+			if after == ' ' || after == '>' || after == '/' {
+				// <w:p ...> or <w:p>; not <w:pPr>.
+				close := strings.Index(body[idx:], ">")
+				if close < 0 {
+					return 0, 0, false
+				}
+				pStart = idx
+				break
+			}
+		}
+		cursor = idx
+	}
+	if pStart < 0 {
+		return 0, 0, false
+	}
+	// Walk forward to find the matching </w:p>. <w:p> doesn't nest so
+	// the next </w:p> after the marker is the close.
+	pEndIdx := strings.Index(body[markerEnd:], "</w:p>")
+	if pEndIdx < 0 {
+		return 0, 0, false
+	}
+	pEnd := markerEnd + pEndIdx + len("</w:p>")
+	return pStart, pEnd, true
+}
+
+// spliceSections replaces anchor slots with rendered sections and
+// appends any unanchored sections before sectPr. Returns the assembled
+// document.xml body.
+func spliceSections(documentXML []byte, rendered map[string]string, kept []SubmissionSection, all []SubmissionSection) []byte {
+	body := string(documentXML)
+	pairs := findAllAnchorPairs(body)
+
+	// Build a lookup of kept section keys for quick membership tests.
+	keptByKey := map[string]int{}
+	for i, sec := range kept {
+		keptByKey[sec.SectionKey] = i
+	}
+	allByKey := map[string]int{}
+	for i, sec := range all {
+		allByKey[sec.SectionKey] = i
+	}
+
+	matchedKeys := map[string]bool{}
+
+	// Walk pairs in REVERSE body-order so slice mutations don't shift
+	// later offsets.
+	sort.SliceStable(pairs, func(i, j int) bool {
+		return pairs[i].openStart > pairs[j].openStart
+	})
+	for _, p := range pairs {
+		replacement := ""
+		if idx, ok := keptByKey[p.key]; ok {
+			replacement = rendered[p.key]
+			matchedKeys[p.key] = true
+			_ = idx
+		} else if _, isOnDraft := allByKey[p.key]; isOnDraft {
+			// Anchor matches an excluded section on the draft — drop
+			// the entire slot.
+			replacement = ""
+		} else {
+			// Anchor doesn't match any section on this draft — drop
+			// to leave the base's chrome unbroken.
+			replacement = ""
+		}
+		body = body[:p.openStart] + replacement + body[p.closeEnd:]
+	}
+
+	// Append unanchored sections before sectPr in order_index ASC.
+	var unanchored strings.Builder
+	for _, sec := range kept {
+		if matchedKeys[sec.SectionKey] {
+			continue
+		}
+		unanchored.WriteString(rendered[sec.SectionKey])
+	}
+	if unanchored.Len() > 0 {
+		body = appendBeforeSectPr(body, unanchored.String())
+	}
+
+	return []byte(body)
+}
+
+// appendBeforeSectPr inserts content immediately before the first
+// `<w:sectPr` element in the body, or at the end of the body if there
+// is none. Word documents conventionally close the body with a sectPr
+// describing page setup; we want to land sections before that element
+// so they show up on the actual pages.
+var sectPrRegex = regexp.MustCompile(`<w:sectPr\b`)
+
+func appendBeforeSectPr(body, content string) string {
+	loc := sectPrRegex.FindStringIndex(body)
+	if loc == nil {
+		// No sectPr → append before `</w:body>` if present, else at
+		// the very end.
+		idx := strings.LastIndex(body, "</w:body>")
+		if idx < 0 {
+			return body + content
+		}
+		return body[:idx] + content + body[idx:]
+	}
+	return body[:loc[0]] + content + body[loc[0]:]
+}
+
+// ─────────────────────────────────────────────────────────────────────
+// Zip plumbing
+// ─────────────────────────────────────────────────────────────────────
+
+// baseZipPart captures one zip entry we kept aside while extracting
+// document.xml.
+type baseZipPart struct {
+	name    string
+	method  uint16
+	modTime int64 // wall seconds; converted back to time.Time on repack
+	body    []byte
+}
+
+// splitBaseZip extracts document.xml and returns it alongside every
+// other zip entry, ready for repacking.
+func splitBaseZip(cleanBytes []byte) ([]byte, []baseZipPart, error) {
+	zr, err := zip.NewReader(bytes.NewReader(cleanBytes), int64(len(cleanBytes)))
+	if err != nil {
+		return nil, nil, fmt.Errorf("submission compose: open base zip: %w", err)
+	}
+	var documentXML []byte
+	parts := make([]baseZipPart, 0, len(zr.File))
+	for _, f := range zr.File {
+		body, err := readZipEntry(f)
+		if err != nil {
+			return nil, nil, fmt.Errorf("submission compose: read %s: %w", f.Name, err)
+		}
+		if f.Name == "word/document.xml" {
+			documentXML = body
+			parts = append(parts, baseZipPart{name: f.Name, method: f.Method, modTime: f.Modified.Unix(), body: nil})
+			continue
+		}
+		parts = append(parts, baseZipPart{name: f.Name, method: f.Method, modTime: f.Modified.Unix(), body: body})
+	}
+	if documentXML == nil {
+		return nil, nil, fmt.Errorf("submission compose: base zip missing word/document.xml")
+	}
+	return documentXML, parts, nil
+}
+
+// repackBaseZip rebuilds the zip, swapping document.xml for the
+// assembled body and leaving every other part untouched.
+func repackBaseZip(parts []baseZipPart, assembledBody []byte) ([]byte, error) {
+	var out bytes.Buffer
+	zw := zip.NewWriter(&out)
+	for _, p := range parts {
+		hdr := &zip.FileHeader{
+			Name:   p.name,
+			Method: p.method,
+		}
+		if p.modTime > 0 {
+			hdr.Modified = time.Unix(p.modTime, 0)
+		}
+		w, err := zw.CreateHeader(hdr)
+		if err != nil {
+			return nil, fmt.Errorf("submission compose: write header %s: %w", p.name, err)
+		}
+		body := p.body
+		if p.name == "word/document.xml" {
+			body = assembledBody
+		}
+		if _, err := w.Write(body); err != nil {
+			return nil, fmt.Errorf("submission compose: write body %s: %w", p.name, err)
+		}
+	}
+	if err := zw.Close(); err != nil {
+		return nil, fmt.Errorf("submission compose: finalise zip: %w", err)
+	}
+	return out.Bytes(), nil
+}
+
+func readZipEntry(f *zip.File) ([]byte, error) {
+	rc, err := f.Open()
+	if err != nil {
+		return nil, err
+	}
+	defer rc.Close()
+	return io.ReadAll(rc)
+}

internal/services/submission_compose_test.go

@@ -0,0 +1,276 @@
+package services
+
+// Unit tests for SubmissionComposer's pure splice logic — no DB
+// dependency. The end-to-end Compose path is exercised by the live
+// integration test in submission_section_service_live_test.go (Slice
+// A) once anchors land in the seeded .docx; this file covers the
+// anchor-splicing primitives and the section rendering glue.
+
+import (
+	"archive/zip"
+	"bytes"
+	"context"
+	"strings"
+	"testing"
+
+	"github.com/google/uuid"
+)
+
+// minimalBaseBytes builds a tiny .docx zip with one document.xml body
+// for the composer tests. The body content is provided by the caller
+// so different splice scenarios can be exercised in-process.
+func minimalBaseBytes(t *testing.T, body string) []byte {
+	t.Helper()
+	var buf bytes.Buffer
+	zw := zip.NewWriter(&buf)
+
+	parts := map[string]string{
+		"[Content_Types].xml": `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
+  <Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>
+  <Default Extension="xml" ContentType="application/xml"/>
+  <Override PartName="/word/document.xml" ContentType="application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml"/>
+</Types>`,
+		"_rels/.rels": `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
+  <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="word/document.xml"/>
+</Relationships>`,
+		"word/document.xml": `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<w:document xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main">
+<w:body>` + body + `</w:body>
+</w:document>`,
+	}
+	for name, contents := range parts {
+		w, err := zw.Create(name)
+		if err != nil {
+			t.Fatalf("zip create %s: %v", name, err)
+		}
+		if _, err := w.Write([]byte(contents)); err != nil {
+			t.Fatalf("zip write %s: %v", name, err)
+		}
+	}
+	if err := zw.Close(); err != nil {
+		t.Fatalf("zip close: %v", err)
+	}
+	return buf.Bytes()
+}
+
+// extractDocumentXML pulls word/document.xml out of a .docx zip for
+// assertions.
+func extractDocumentXML(t *testing.T, data []byte) string {
+	t.Helper()
+	zr, err := zip.NewReader(bytes.NewReader(data), int64(len(data)))
+	if err != nil {
+		t.Fatalf("open zip: %v", err)
+	}
+	for _, f := range zr.File {
+		if f.Name != "word/document.xml" {
+			continue
+		}
+		rc, err := f.Open()
+		if err != nil {
+			t.Fatalf("open document.xml: %v", err)
+		}
+		defer rc.Close()
+		var buf bytes.Buffer
+		if _, err := buf.ReadFrom(rc); err != nil {
+			t.Fatalf("read document.xml: %v", err)
+		}
+		return buf.String()
+	}
+	t.Fatal("document.xml not found in zip")
+	return ""
+}
+
+// composerBase returns a SubmissionBase wired with the neutral
+// stylemap for composer tests.
+func composerBase() *SubmissionBase {
+	return &SubmissionBase{
+		ID:   uuid.New(),
+		Slug: "test-base",
+		SectionSpec: BaseSectionSpec{
+			Version: 1,
+			Stylemap: map[string]string{
+				"paragraph": "Normal",
+			},
+		},
+	}
+}
+
+func TestComposer_AppendMode_NoAnchors(t *testing.T) {
+	// Base has no anchors → composer appends sections before sectPr.
+	base := composerBase()
+	body := `<w:p><w:r><w:t>Static chrome</w:t></w:r></w:p><w:sectPr/>`
+	baseBytes := minimalBaseBytes(t, body)
+	composer := NewSubmissionComposer(NewSubmissionRenderer())
+
+	sections := []SubmissionSection{
+		{ID: uuid.New(), SectionKey: "facts", OrderIndex: 1, Kind: "prose", Included: true, ContentMDDE: "Section text"},
+	}
+	out, err := composer.Compose(context.Background(), ComposeOptions{
+		Sections:  sections,
+		Base:      base,
+		BaseBytes: baseBytes,
+		Lang:      "de",
+		Vars:      PlaceholderMap{},
+	})
+	if err != nil {
+		t.Fatalf("Compose: %v", err)
+	}
+	docXML := extractDocumentXML(t, out)
+	if !strings.Contains(docXML, "Static chrome") {
+		t.Errorf("base chrome dropped: %q", docXML)
+	}
+	if !strings.Contains(docXML, "Section text") {
+		t.Errorf("section content missing: %q", docXML)
+	}
+	// Section must land before sectPr (rule of thumb: it's an end-of-body element).
+	staticIdx := strings.Index(docXML, "Section text")
+	sectPrIdx := strings.Index(docXML, "<w:sectPr")
+	if staticIdx < 0 || sectPrIdx < 0 || staticIdx > sectPrIdx {
+		t.Errorf("section landed after sectPr: section=%d sectPr=%d", staticIdx, sectPrIdx)
+	}
+}
+
+func TestComposer_AnchorMode_SpliceContent(t *testing.T) {
+	base := composerBase()
+	body := `<w:p><w:r><w:t>Header</w:t></w:r></w:p>` +
+		`<w:p><w:r><w:t>{{#section:facts}}</w:t></w:r></w:p>` +
+		`<w:p><w:r><w:t>(seed)</w:t></w:r></w:p>` +
+		`<w:p><w:r><w:t>{{/section:facts}}</w:t></w:r></w:p>` +
+		`<w:p><w:r><w:t>Footer</w:t></w:r></w:p>`
+	baseBytes := minimalBaseBytes(t, body)
+	composer := NewSubmissionComposer(NewSubmissionRenderer())
+
+	sections := []SubmissionSection{
+		{ID: uuid.New(), SectionKey: "facts", OrderIndex: 1, Kind: "prose", Included: true, ContentMDDE: "Real prose"},
+	}
+	out, err := composer.Compose(context.Background(), ComposeOptions{
+		Sections: sections, Base: base, BaseBytes: baseBytes, Lang: "de",
+	})
+	if err != nil {
+		t.Fatalf("Compose: %v", err)
+	}
+	docXML := extractDocumentXML(t, out)
+	if !strings.Contains(docXML, "Header") || !strings.Contains(docXML, "Footer") {
+		t.Errorf("base chrome dropped: %q", docXML)
+	}
+	if !strings.Contains(docXML, "Real prose") {
+		t.Errorf("section content missing: %q", docXML)
+	}
+	// Anchor paragraphs themselves must be gone.
+	if strings.Contains(docXML, "{{#section:facts}}") || strings.Contains(docXML, "{{/section:facts}}") {
+		t.Errorf("anchor markers survived: %q", docXML)
+	}
+	// Seed content between anchors must be gone (replaced by the
+	// composed section).
+	if strings.Contains(docXML, "(seed)") {
+		t.Errorf("anchor-spanned seed survived: %q", docXML)
+	}
+}
+
+func TestComposer_ExcludedSection_DropsAnchorPair(t *testing.T) {
+	base := composerBase()
+	body := `<w:p><w:r><w:t>Header</w:t></w:r></w:p>` +
+		`<w:p><w:r><w:t>{{#section:exhibits}}</w:t></w:r></w:p>` +
+		`<w:p><w:r><w:t>(default)</w:t></w:r></w:p>` +
+		`<w:p><w:r><w:t>{{/section:exhibits}}</w:t></w:r></w:p>` +
+		`<w:p><w:r><w:t>Footer</w:t></w:r></w:p>`
+	baseBytes := minimalBaseBytes(t, body)
+	composer := NewSubmissionComposer(NewSubmissionRenderer())
+
+	sections := []SubmissionSection{
+		{ID: uuid.New(), SectionKey: "exhibits", OrderIndex: 8, Kind: "prose", Included: false, ContentMDDE: "ignored"},
+	}
+	out, err := composer.Compose(context.Background(), ComposeOptions{
+		Sections: sections, Base: base, BaseBytes: baseBytes, Lang: "de",
+	})
+	if err != nil {
+		t.Fatalf("Compose: %v", err)
+	}
+	docXML := extractDocumentXML(t, out)
+	if strings.Contains(docXML, "{{#section:exhibits}}") || strings.Contains(docXML, "{{/section:exhibits}}") {
+		t.Errorf("anchors for excluded section survived: %q", docXML)
+	}
+	if strings.Contains(docXML, "ignored") {
+		t.Errorf("excluded section content rendered: %q", docXML)
+	}
+}
+
+func TestComposer_PlaceholdersResolve(t *testing.T) {
+	base := composerBase()
+	body := `<w:p><w:r><w:t>{{#section:greeting}}</w:t></w:r></w:p>` +
+		`<w:p><w:r><w:t>{{/section:greeting}}</w:t></w:r></w:p>`
+	baseBytes := minimalBaseBytes(t, body)
+	composer := NewSubmissionComposer(NewSubmissionRenderer())
+
+	sections := []SubmissionSection{
+		{ID: uuid.New(), SectionKey: "greeting", OrderIndex: 1, Kind: "prose", Included: true, ContentMDDE: "Hallo {{user.name}}"},
+	}
+	out, err := composer.Compose(context.Background(), ComposeOptions{
+		Sections: sections, Base: base, BaseBytes: baseBytes, Lang: "de",
+		Vars: PlaceholderMap{"user.name": "Maria Schmidt"},
+	})
+	if err != nil {
+		t.Fatalf("Compose: %v", err)
+	}
+	docXML := extractDocumentXML(t, out)
+	if !strings.Contains(docXML, "Hallo") || !strings.Contains(docXML, "Maria Schmidt") {
+		t.Errorf("placeholder not substituted: %q", docXML)
+	}
+	if strings.Contains(docXML, "{{user.name}}") {
+		t.Errorf("placeholder survived: %q", docXML)
+	}
+}
+
+func TestComposer_LangPicksColumn(t *testing.T) {
+	base := composerBase()
+	body := `<w:p><w:r><w:t>{{#section:facts}}</w:t></w:r></w:p><w:p><w:r><w:t>{{/section:facts}}</w:t></w:r></w:p>`
+	baseBytes := minimalBaseBytes(t, body)
+	composer := NewSubmissionComposer(NewSubmissionRenderer())
+
+	sections := []SubmissionSection{
+		{ID: uuid.New(), SectionKey: "facts", OrderIndex: 1, Kind: "prose", Included: true,
+			ContentMDDE: "deutscher text", ContentMDEN: "english text"},
+	}
+	deOut, _ := composer.Compose(context.Background(), ComposeOptions{
+		Sections: sections, Base: base, BaseBytes: baseBytes, Lang: "de",
+	})
+	enOut, _ := composer.Compose(context.Background(), ComposeOptions{
+		Sections: sections, Base: base, BaseBytes: baseBytes, Lang: "en",
+	})
+	deXML := extractDocumentXML(t, deOut)
+	enXML := extractDocumentXML(t, enOut)
+	if !strings.Contains(deXML, "deutscher text") || strings.Contains(deXML, "english text") {
+		t.Errorf("DE pick failed: %q", deXML)
+	}
+	if !strings.Contains(enXML, "english text") || strings.Contains(enXML, "deutscher text") {
+		t.Errorf("EN pick failed: %q", enXML)
+	}
+}
+
+func TestComposer_OrderIndexAscending(t *testing.T) {
+	base := composerBase()
+	// No anchors → both sections append in order_index ASC order
+	// before sectPr.
+	body := `<w:sectPr/>`
+	baseBytes := minimalBaseBytes(t, body)
+	composer := NewSubmissionComposer(NewSubmissionRenderer())
+
+	sections := []SubmissionSection{
+		{ID: uuid.New(), SectionKey: "second", OrderIndex: 2, Kind: "prose", Included: true, ContentMDDE: "ZWEITER"},
+		{ID: uuid.New(), SectionKey: "first", OrderIndex: 1, Kind: "prose", Included: true, ContentMDDE: "ERSTER"},
+	}
+	out, err := composer.Compose(context.Background(), ComposeOptions{
+		Sections: sections, Base: base, BaseBytes: baseBytes, Lang: "de",
+	})
+	if err != nil {
+		t.Fatalf("Compose: %v", err)
+	}
+	docXML := extractDocumentXML(t, out)
+	firstIdx := strings.Index(docXML, "ERSTER")
+	secondIdx := strings.Index(docXML, "ZWEITER")
+	if firstIdx < 0 || secondIdx < 0 || firstIdx > secondIdx {
+		t.Errorf("order_index ASC not honoured: ERSTER=%d ZWEITER=%d", firstIdx, secondIdx)
+	}
+}

internal/services/submission_draft_service.go

@@ -58,8 +58,17 @@ type SubmissionDraft struct {
 	LastExportedAt     *time.Time     `db:"last_exported_at"    json:"last_exported_at,omitempty"`
 	LastExportedSHA    *string        `db:"last_exported_sha"   json:"last_exported_sha,omitempty"`
 	LastImportedAt     *time.Time     `db:"last_imported_at"    json:"last_imported_at,omitempty"`
-	CreatedAt          time.Time      `db:"created_at"          json:"created_at"`
-	UpdatedAt          time.Time      `db:"updated_at"          json:"updated_at"`
+	// BaseID is the Composer base reference (t-paliad-313). NULL on
+	// pre-Composer drafts — the v1 render path stays the fallback.
+	// ON DELETE SET NULL keeps a draft renderable if its base is
+	// removed; the lawyer picks a new one via the sidebar.
+	BaseID *uuid.UUID `db:"base_id" json:"base_id,omitempty"`
+	// ComposerMetaRaw / ComposerMeta — Composer-side metadata jsonb.
+	// Slice A: empty default. Future slices populate section_order,
+	// hidden_sections, etc.
+	ComposerMetaRaw []byte         `db:"composer_meta"       json:"-"`
+	CreatedAt       time.Time      `db:"created_at"          json:"created_at"`
+	UpdatedAt       time.Time      `db:"updated_at"          json:"updated_at"`
 
 	// Variables is the decoded overrides map; populated on read by the
 	// service so callers don't have to unmarshal manually.
@@ -70,15 +79,36 @@ type SubmissionDraft struct {
 	// the backward-compat "include every party" behaviour; a non-empty
 	// slice restricts the variable bag to the listed paliad.parties rows.
 	SelectedParties []uuid.UUID `json:"selected_parties"`
+
+	// ComposerMeta is the parsed Composer-side metadata (t-paliad-313).
+	// Slice A: typically empty. Populated on read by decodeComposerMeta().
+	ComposerMeta map[string]any `json:"composer_meta"`
 }
 
 // SubmissionDraftService handles CRUD on submission_drafts and exposes
 // the render/preview/export entry points the handler layer calls.
+//
+// The Composer wiring (t-paliad-313, Slice A): bases + sections are
+// optional — when nil the service stays back-compat with the v1 shape
+// (drafts created without a base_id, no section rows). When wired, new
+// drafts created via Create get base_id seeded from the firm default
+// and submission_sections rows inserted from the base's section spec.
 type SubmissionDraftService struct {
 	db       *sqlx.DB
 	projects *ProjectService
 	vars     *SubmissionVarsService
 	renderer *SubmissionRenderer
+
+	// bases + sections are optional Composer wiring (t-paliad-313).
+	// Nil means "stay back-compat with the v1 shape" — new drafts
+	// keep base_id NULL and no submission_sections rows get seeded.
+	bases    *BaseService
+	sections *SectionService
+
+	// firmName captures branding.Name at construction time. Used to
+	// resolve the firm-default base in Create. Empty string is
+	// allowed (treated as "no firm filter" at base-lookup time).
+	firmName string
 }
 
 // NewSubmissionDraftService wires the service.
@@ -91,6 +121,19 @@ func NewSubmissionDraftService(db *sqlx.DB, projects *ProjectService, vars *Subm
 	}
 }
 
+// AttachComposer wires the Composer-side services. Called by
+// cmd/server/main.go after constructing the base + section services.
+// firm is branding.Name (typically "HLC"); empty string disables the
+// firm filter at default-base lookup.
+//
+// Calling AttachComposer is purely additive — drafts created before the
+// call (or with bases==nil) keep the v1 behaviour. Idempotent.
+func (s *SubmissionDraftService) AttachComposer(bases *BaseService, sections *SectionService, firm string) {
+	s.bases = bases
+	s.sections = sections
+	s.firmName = firm
+}
+
 // DraftPatch carries optional fields for Update. nil pointer = "no
 // change"; non-nil = "set to this". Variables is replace-semantics —
 // the lawyer's sidebar sends the full map every save.
@@ -117,6 +160,16 @@ type DraftPatch struct {
 	// Language sets the output language. Valid values: "de", "en".
 	// Anything else returns ErrInvalidInput. t-paliad-276.
 	Language *string
+
+	// BaseID swaps the Composer base. Two-level pointer mirrors the
+	// ProjectID shape so callers can encode the three operations:
+	//   nil          → no change
+	//   *p == nil    → clear (set base_id NULL, return to v1 fallback)
+	//   **p          → set to the picked base
+	// Slice A: lawyer flips this from the sidebar picker. Section
+	// content is unaffected — the base swap is render-side only.
+	// t-paliad-313.
+	BaseID **uuid.UUID
 }
 
 // ErrSubmissionDraftNotFound is the sentinel for "no draft with that id
@@ -133,6 +186,7 @@ const draftColumns = `id, project_id, submission_code, user_id, name, language,
                       variables, selected_parties,
                       last_exported_at, last_exported_sha,
                       last_imported_at,
+                      base_id, composer_meta,
                       created_at, updated_at`
 
 // List returns every draft for (project, submission_code, user)
@@ -185,6 +239,7 @@ func (s *SubmissionDraftService) ListAllForUser(ctx context.Context, userID uuid
 		`SELECT d.id, d.project_id, d.submission_code, d.user_id, d.name, d.language,
 		        d.variables, d.selected_parties,
 		        d.last_exported_at, d.last_exported_sha, d.last_imported_at,
+		        d.base_id, d.composer_meta,
 		        d.created_at, d.updated_at,
 		        p.title     AS project_title,
 		        p.reference AS project_reference
@@ -279,6 +334,14 @@ func (s *SubmissionDraftService) EnsureLatest(ctx context.Context, userID, proje
 // A nil projectID creates a project-less draft (t-paliad-243); the
 // visibility check is skipped — the caller is the owner and the row is
 // private to them.
+//
+// Composer wiring (t-paliad-313, Slice A): when AttachComposer has
+// been called and a base resolves for the submission_code, the INSERT
+// runs in a transaction alongside SectionService.SeedFromSpec so the
+// new draft and its seeded sections land atomically. If the base
+// lookup fails (catalog empty, no firm match, etc.) the draft still
+// creates with base_id=NULL — Composer is additive, the v1 fallback
+// path remains valid.
 func (s *SubmissionDraftService) Create(ctx context.Context, userID uuid.UUID, projectID *uuid.UUID, submissionCode, lang string) (*SubmissionDraft, error) {
 	if projectID != nil {
 		if _, err := s.projects.GetByID(ctx, userID, *projectID); err != nil {
@@ -294,16 +357,61 @@ func (s *SubmissionDraftService) Create(ctx context.Context, userID uuid.UUID, p
 	// Anything other than "en" normalizes to "de" — matches the DB CHECK
 	// constraint and the project's primary-language default.
 	draftLang := normalizeDraftLanguage(lang)
+
+	// Resolve the Composer base for this draft. nil result keeps the
+	// draft v1-shaped (base_id NULL, no sections rows).
+	var baseToSeed *SubmissionBase
+	if s.bases != nil {
+		base, err := s.bases.GetDefaultForCode(ctx, s.firmName, submissionCode)
+		switch {
+		case err == nil:
+			baseToSeed = base
+		case errors.Is(err, ErrBaseNotFound):
+			// Catalog empty / no match — fall through to v1 shape.
+		default:
+			return nil, err
+		}
+	}
+
+	tx, err := s.db.BeginTxx(ctx, nil)
+	if err != nil {
+		return nil, fmt.Errorf("begin create submission draft tx: %w", err)
+	}
+	committed := false
+	defer func() {
+		if !committed {
+			_ = tx.Rollback()
+		}
+	}()
+
+	var baseID *uuid.UUID
+	if baseToSeed != nil {
+		id := baseToSeed.ID
+		baseID = &id
+	}
+
 	var d SubmissionDraft
-	err = s.db.GetContext(ctx, &d,
+	err = tx.GetContext(ctx, &d,
 		`INSERT INTO paliad.submission_drafts
-		     (project_id, submission_code, user_id, name, language)
-		 VALUES ($1, $2, $3, $4, $5)
+		     (project_id, submission_code, user_id, name, language, base_id)
+		 VALUES ($1, $2, $3, $4, $5, $6)
 		 RETURNING `+draftColumns,
-		projectID, submissionCode, userID, name, draftLang)
+		projectID, submissionCode, userID, name, draftLang, baseID)
 	if err != nil {
 		return nil, fmt.Errorf("create submission draft: %w", err)
 	}
+
+	if baseToSeed != nil && s.sections != nil {
+		if err := s.sections.SeedFromSpec(ctx, tx, d.ID, baseToSeed.SectionSpec); err != nil {
+			return nil, err
+		}
+	}
+
+	if err := tx.Commit(); err != nil {
+		return nil, fmt.Errorf("commit create submission draft tx: %w", err)
+	}
+	committed = true
+
 	if err := d.decode(); err != nil {
 		return nil, err
 	}
@@ -446,6 +554,18 @@ func (s *SubmissionDraftService) Update(ctx context.Context, userID, draftID uui
 		idx++
 	}
 
+	if patch.BaseID != nil {
+		newBID := *patch.BaseID // *uuid.UUID — nil means clear
+		if newBID != nil && s.bases != nil {
+			// Validate the picked base exists + is active.
+			if _, err := s.bases.GetByID(ctx, *newBID); err != nil {
+				return nil, err
+			}
+		}
+		setParts = append(setParts, fmt.Sprintf("base_id = $%d", idx))
+		args = append(args, newBID)
+		idx++
+	}
 
 	if len(setParts) == 0 {
 		return existing, nil
@@ -682,14 +802,32 @@ func (s *SubmissionDraftService) RenderProjectSubmission(ctx context.Context, us
 	return out, resolved, nil
 }
 
-// decode fills the parsed views (Variables, SelectedParties) from the
-// raw scan fields. Called by every fetch path so the caller sees both
-// populated together.
+// decode fills the parsed views (Variables, SelectedParties,
+// ComposerMeta) from the raw scan fields. Called by every fetch path
+// so the caller sees them populated together.
 func (d *SubmissionDraft) decode() error {
 	if err := d.decodeVariables(); err != nil {
 		return err
 	}
-	return d.decodeSelectedParties()
+	if err := d.decodeSelectedParties(); err != nil {
+		return err
+	}
+	return d.decodeComposerMeta()
+}
+
+// decodeComposerMeta turns the raw composer_meta jsonb into a
+// map[string]any. NULL or empty payload yields an empty map.
+func (d *SubmissionDraft) decodeComposerMeta() error {
+	if len(d.ComposerMetaRaw) == 0 {
+		d.ComposerMeta = map[string]any{}
+		return nil
+	}
+	out := map[string]any{}
+	if err := json.Unmarshal(d.ComposerMetaRaw, &out); err != nil {
+		return fmt.Errorf("decode submission draft composer_meta: %w", err)
+	}
+	d.ComposerMeta = out
+	return nil
 }
 
 // decodeVariables turns the raw jsonb bytes into the PlaceholderMap.

internal/services/submission_md.go

@@ -0,0 +1,239 @@
+package services
+
+// Markdown → OOXML walker for Composer section content (t-paliad-313
+// Slice B, design doc §9.2).
+//
+// Scope per the head's Slice B brief: paragraphs + inline bold/italic
+// only. Headings, lists, blockquote, links land in Slice D's rich-prose
+// pass. This walker is intentionally minimal — every Markdown construct
+// it doesn't recognise is rendered as a plain paragraph so the lawyer's
+// prose round-trips losslessly even when they hit Markdown the walker
+// doesn't yet understand.
+//
+// The output uses the base's stylemap.paragraph entry for the
+// <w:pStyle> on each paragraph so the styling matches the base's
+// typography (HLpat-Body-B0 on the HLC base, Normal on the neutral
+// base, etc.).
+//
+// Placeholders ({{path.dot.notation}}) are preserved verbatim — they
+// pass through the walker untouched and get substituted by the v1
+// SubmissionRenderer's placeholder pass after the composer assembly.
+//
+// Grammar supported:
+//
+//   - Blank line          → paragraph break
+//   - `**bold**`          → <w:r><w:rPr><w:b/></w:rPr><w:t>…</w:t></w:r>
+//   - `*italic*` or `_italic_` → <w:r><w:rPr><w:i/></w:rPr>…</w:r>
+//   - Otherwise           → plain text run
+
+import (
+	"strings"
+)
+
+// RenderMarkdownToOOXML renders the given Markdown source into OOXML
+// paragraph elements (`<w:p>…</w:p>`), suitable for splicing into a
+// .docx body. Each paragraph carries `<w:pStyle w:val="<paragraphStyle>"/>`
+// when paragraphStyle is non-empty.
+//
+// Empty input renders one empty paragraph so the splice site is
+// well-formed even when the lawyer hasn't typed anything in this
+// section.
+func RenderMarkdownToOOXML(md, paragraphStyle string) string {
+	if md == "" {
+		return emptyParagraph(paragraphStyle)
+	}
+	paragraphs := splitMarkdownParagraphs(md)
+	if len(paragraphs) == 0 {
+		return emptyParagraph(paragraphStyle)
+	}
+	var b strings.Builder
+	for _, para := range paragraphs {
+		b.WriteString(renderParagraph(para, paragraphStyle))
+	}
+	return b.String()
+}
+
+// splitMarkdownParagraphs splits the source into paragraphs. A
+// "paragraph" is a maximal run of non-blank lines. N consecutive blank
+// lines between two paragraphs produce (N-1) empty paragraphs in the
+// output so the lawyer's intentional vertical spacing survives.
+//
+// CRLF line endings normalise to LF before splitting.
+func splitMarkdownParagraphs(md string) []string {
+	normalised := strings.ReplaceAll(md, "\r\n", "\n")
+	lines := strings.Split(normalised, "\n")
+	var paragraphs []string
+	var current []string
+	blankRun := 0
+	flushParagraph := func() {
+		if len(current) > 0 {
+			paragraphs = append(paragraphs, strings.Join(current, "\n"))
+			current = nil
+		}
+	}
+	for _, line := range lines {
+		if strings.TrimSpace(line) == "" {
+			if len(current) > 0 {
+				// End of a paragraph; the blank-counting starts now.
+				flushParagraph()
+				blankRun = 1
+				continue
+			}
+			// Already inside a blank run (or before the first paragraph).
+			blankRun++
+			continue
+		}
+		// Starting a new paragraph — emit (blankRun-1) empty paragraphs
+		// in between if the lawyer used multiple blank lines as
+		// vertical spacing.
+		for i := 1; i < blankRun; i++ {
+			paragraphs = append(paragraphs, "")
+		}
+		blankRun = 0
+		current = append(current, line)
+	}
+	flushParagraph()
+	return paragraphs
+}
+
+// renderParagraph emits one `<w:p>` element for the given paragraph
+// text. Inline bold/italic spans become `<w:r>` runs with the
+// corresponding `<w:rPr>`.
+func renderParagraph(text, paragraphStyle string) string {
+	var b strings.Builder
+	b.WriteString(`<w:p>`)
+	if paragraphStyle != "" {
+		b.WriteString(`<w:pPr><w:pStyle w:val="`)
+		b.WriteString(xmlAttrEscape(paragraphStyle))
+		b.WriteString(`"/></w:pPr>`)
+	}
+	if text == "" {
+		// Empty paragraph — emit a single empty run so Word renders the
+		// paragraph as a blank line. Without the run, some Word
+		// versions collapse the paragraph entirely.
+		b.WriteString(`<w:r><w:t xml:space="preserve"></w:t></w:r>`)
+		b.WriteString(`</w:p>`)
+		return b.String()
+	}
+	for _, span := range parseInlineSpans(text) {
+		b.WriteString(renderRun(span))
+	}
+	b.WriteString(`</w:p>`)
+	return b.String()
+}
+
+// inlineSpan is one piece of inline content: a text payload plus
+// formatting flags. Bold and italic are independent — `***both***`
+// produces one span with both flags set.
+type inlineSpan struct {
+	Text   string
+	Bold   bool
+	Italic bool
+}
+
+// parseInlineSpans tokenises Markdown inline formatting into runs of
+// (text, bold, italic). The grammar is intentionally narrow:
+//
+//   - `**…**` → bold
+//   - `__…__` → bold (Markdown alternate)
+//   - `*…*`   → italic
+//   - `_…_`   → italic (Markdown alternate)
+//   - Anything else flows through as plain text.
+//
+// Unbalanced delimiters fall through as literal characters — the
+// walker never errors on malformed Markdown. Nested formatting (e.g.
+// `**bold *bold-italic* bold**`) toggles flags as it walks.
+func parseInlineSpans(text string) []inlineSpan {
+	var out []inlineSpan
+	var cur strings.Builder
+	bold := false
+	italic := false
+	flush := func() {
+		if cur.Len() == 0 {
+			return
+		}
+		out = append(out, inlineSpan{Text: cur.String(), Bold: bold, Italic: italic})
+		cur.Reset()
+	}
+	i := 0
+	n := len(text)
+	for i < n {
+		// Bold delimiters first (longer match wins over italic).
+		if i+1 < n && (text[i:i+2] == "**" || text[i:i+2] == "__") {
+			flush()
+			bold = !bold
+			i += 2
+			continue
+		}
+		if text[i] == '*' || text[i] == '_' {
+			flush()
+			italic = !italic
+			i++
+			continue
+		}
+		cur.WriteByte(text[i])
+		i++
+	}
+	flush()
+	if len(out) == 0 {
+		out = append(out, inlineSpan{Text: ""})
+	}
+	return out
+}
+
+// renderRun emits one `<w:r>` element for an inline span. Empty text
+// spans render as empty runs (Word accepts them; they're harmless).
+func renderRun(span inlineSpan) string {
+	var b strings.Builder
+	b.WriteString(`<w:r>`)
+	if span.Bold || span.Italic {
+		b.WriteString(`<w:rPr>`)
+		if span.Bold {
+			b.WriteString(`<w:b/>`)
+		}
+		if span.Italic {
+			b.WriteString(`<w:i/>`)
+		}
+		b.WriteString(`</w:rPr>`)
+	}
+	b.WriteString(`<w:t xml:space="preserve">`)
+	b.WriteString(xmlTextEscape(span.Text))
+	b.WriteString(`</w:t></w:r>`)
+	return b.String()
+}
+
+// emptyParagraph returns one empty `<w:p>` with the given style. Used
+// when a section's content_md is empty so the splice site stays
+// well-formed.
+func emptyParagraph(paragraphStyle string) string {
+	var b strings.Builder
+	b.WriteString(`<w:p>`)
+	if paragraphStyle != "" {
+		b.WriteString(`<w:pPr><w:pStyle w:val="`)
+		b.WriteString(xmlAttrEscape(paragraphStyle))
+		b.WriteString(`"/></w:pPr>`)
+	}
+	b.WriteString(`<w:r><w:t xml:space="preserve"></w:t></w:r></w:p>`)
+	return b.String()
+}
+
+// xmlTextEscape escapes the five XML-significant characters for safe
+// insertion into <w:t> content. & first to avoid double-encoding.
+func xmlTextEscape(s string) string {
+	s = strings.ReplaceAll(s, "&", "&amp;")
+	s = strings.ReplaceAll(s, "<", "&lt;")
+	s = strings.ReplaceAll(s, ">", "&gt;")
+	// Quotes and apostrophes are legal inside element text content;
+	// no need to escape them here.
+	return s
+}
+
+// xmlAttrEscape escapes for safe insertion into an attribute value
+// (e.g. `<w:pStyle w:val="…"/>`).
+func xmlAttrEscape(s string) string {
+	s = strings.ReplaceAll(s, "&", "&amp;")
+	s = strings.ReplaceAll(s, "<", "&lt;")
+	s = strings.ReplaceAll(s, ">", "&gt;")
+	s = strings.ReplaceAll(s, `"`, "&quot;")
+	return s
+}

internal/services/submission_md_test.go

@@ -0,0 +1,146 @@
+package services
+
+// Unit tests for the Composer's Markdown → OOXML walker (t-paliad-313
+// Slice B). Pure function; no DB dependency.
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestRenderMarkdownToOOXML_EmptyInput(t *testing.T) {
+	out := RenderMarkdownToOOXML("", "Normal")
+	if !strings.Contains(out, `<w:p>`) {
+		t.Errorf("empty input must still emit one <w:p>; got %q", out)
+	}
+	if !strings.Contains(out, `<w:pStyle w:val="Normal"/>`) {
+		t.Errorf("empty input must carry the paragraph style; got %q", out)
+	}
+}
+
+func TestRenderMarkdownToOOXML_SingleParagraph(t *testing.T) {
+	out := RenderMarkdownToOOXML("Hello world", "HLpat-Body-B0")
+	if !strings.Contains(out, `<w:pStyle w:val="HLpat-Body-B0"/>`) {
+		t.Errorf("paragraph missing stylemap entry: %q", out)
+	}
+	if !strings.Contains(out, "Hello world") {
+		t.Errorf("paragraph text missing: %q", out)
+	}
+	// Exactly one <w:p>.
+	if got := strings.Count(out, "<w:p>"); got != 1 {
+		t.Errorf("expected 1 <w:p>; got %d", got)
+	}
+}
+
+func TestRenderMarkdownToOOXML_TwoParagraphs(t *testing.T) {
+	out := RenderMarkdownToOOXML("first\n\nsecond", "Normal")
+	if got := strings.Count(out, "<w:p>"); got != 2 {
+		t.Errorf("expected 2 <w:p>; got %d, out=%q", got, out)
+	}
+	if !strings.Contains(out, "first") || !strings.Contains(out, "second") {
+		t.Errorf("paragraph text missing: %q", out)
+	}
+}
+
+func TestRenderMarkdownToOOXML_BoldInline(t *testing.T) {
+	out := RenderMarkdownToOOXML("hello **bold** world", "")
+	if !strings.Contains(out, `<w:rPr><w:b/></w:rPr>`) {
+		t.Errorf("bold rPr missing: %q", out)
+	}
+	if !strings.Contains(out, ">bold<") {
+		t.Errorf("bold text payload missing: %q", out)
+	}
+	// The surrounding "hello " and " world" pieces are separate runs;
+	// the bold rPr should appear exactly once in this output.
+	if got := strings.Count(out, "<w:b/>"); got != 1 {
+		t.Errorf("expected exactly one <w:b/> tag; got %d in %q", got, out)
+	}
+}
+
+func TestRenderMarkdownToOOXML_ItalicInline(t *testing.T) {
+	out := RenderMarkdownToOOXML("see *italic* here", "")
+	if !strings.Contains(out, `<w:rPr><w:i/></w:rPr>`) {
+		t.Errorf("italic rPr missing: %q", out)
+	}
+	if !strings.Contains(out, ">italic<") {
+		t.Errorf("italic text payload missing: %q", out)
+	}
+}
+
+func TestRenderMarkdownToOOXML_BoldItalicCombo(t *testing.T) {
+	// Nested: ***both*** → entering both flags. The walker toggles each
+	// delimiter independently, so the resulting run carries both <w:b/>
+	// and <w:i/>.
+	out := RenderMarkdownToOOXML("***both***", "")
+	if !strings.Contains(out, `<w:b/>`) || !strings.Contains(out, `<w:i/>`) {
+		t.Errorf("expected both <w:b/> and <w:i/>; got %q", out)
+	}
+}
+
+func TestRenderMarkdownToOOXML_PlaceholdersPassThrough(t *testing.T) {
+	// Placeholders are sacred — the walker must preserve them verbatim
+	// so the v1 placeholder pass can substitute them later.
+	out := RenderMarkdownToOOXML("Sehr geehrter {{parties.claimant.0.name}}", "Normal")
+	if !strings.Contains(out, "{{parties.claimant.0.name}}") {
+		t.Errorf("placeholder corrupted: %q", out)
+	}
+}
+
+func TestRenderMarkdownToOOXML_XMLEscape(t *testing.T) {
+	out := RenderMarkdownToOOXML("a & b < c > d", "")
+	if strings.Contains(out, " & ") {
+		t.Errorf("unescaped & survived: %q", out)
+	}
+	if !strings.Contains(out, "&amp;") || !strings.Contains(out, "&lt;") || !strings.Contains(out, "&gt;") {
+		t.Errorf("expected escaped entities; got %q", out)
+	}
+}
+
+func TestRenderMarkdownToOOXML_BlankLinesPreserveSpacing(t *testing.T) {
+	// Two blank lines between paragraphs → one empty paragraph in
+	// between, preserving the lawyer's intentional whitespace.
+	out := RenderMarkdownToOOXML("first\n\n\nsecond", "Normal")
+	if got := strings.Count(out, "<w:p>"); got != 3 {
+		t.Errorf("expected 3 <w:p> (first + blank + second); got %d in %q", got, out)
+	}
+}
+
+func TestRenderMarkdownToOOXML_CRLFNormalisation(t *testing.T) {
+	out := RenderMarkdownToOOXML("first\r\n\r\nsecond", "")
+	if got := strings.Count(out, "<w:p>"); got != 2 {
+		t.Errorf("CRLF input should produce 2 paragraphs; got %d in %q", got, out)
+	}
+}
+
+func TestParseInlineSpans_Plain(t *testing.T) {
+	spans := parseInlineSpans("hello world")
+	if len(spans) != 1 || spans[0].Bold || spans[0].Italic || spans[0].Text != "hello world" {
+		t.Errorf("expected single plain span; got %+v", spans)
+	}
+}
+
+func TestParseInlineSpans_UnderscoreItalic(t *testing.T) {
+	spans := parseInlineSpans("_emph_")
+	var italicHits int
+	for _, s := range spans {
+		if s.Italic && s.Text == "emph" {
+			italicHits++
+		}
+	}
+	if italicHits != 1 {
+		t.Errorf("expected one italic 'emph' span; got %+v", spans)
+	}
+}
+
+func TestParseInlineSpans_UnderscoreBold(t *testing.T) {
+	spans := parseInlineSpans("__strong__")
+	var boldHits int
+	for _, s := range spans {
+		if s.Bold && s.Text == "strong" {
+			boldHits++
+		}
+	}
+	if boldHits != 1 {
+		t.Errorf("expected one bold 'strong' span; got %+v", spans)
+	}
+}

internal/services/submission_section_service.go

@@ -0,0 +1,213 @@
+package services
+
+// Submission section service — Composer Slice A (t-paliad-313, design
+// doc docs/design-submission-generator-v2-2026-05-26.md §4.3 + §6).
+//
+// Each row in paliad.submission_sections is one ordered, named block
+// inside a Composer draft. Slice A seeds rows on draft create from the
+// base's section_spec.defaults and exposes them read-only for the
+// editor's section-list pane. Slice B turns them editable, Slice F
+// adds reorder/hide/add-custom.
+//
+// Visibility flows through draft_id → submission_drafts → owner-scoped
+// + can_see_project (RLS in mig 148 mirrors the four-policy shape on
+// submission_drafts). Service calls go through SubmissionDraftService
+// for the visibility gate before touching this table.
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+)
+
+// SubmissionSection mirrors a row in paliad.submission_sections.
+type SubmissionSection struct {
+	ID           uuid.UUID `db:"id"             json:"id"`
+	DraftID      uuid.UUID `db:"draft_id"       json:"draft_id"`
+	SectionKey   string    `db:"section_key"    json:"section_key"`
+	OrderIndex   int       `db:"order_index"    json:"order_index"`
+	Kind         string    `db:"kind"           json:"kind"`
+	LabelDE      string    `db:"label_de"       json:"label_de"`
+	LabelEN      string    `db:"label_en"       json:"label_en"`
+	Included     bool      `db:"included"       json:"included"`
+	ContentMDDE  string    `db:"content_md_de"  json:"content_md_de"`
+	ContentMDEN  string    `db:"content_md_en"  json:"content_md_en"`
+	CreatedAt    time.Time `db:"created_at"     json:"created_at"`
+	UpdatedAt    time.Time `db:"updated_at"     json:"updated_at"`
+}
+
+// SectionService handles per-draft section rows. Slice A: read + seed
+// only. Editable mutations land in Slice B's brief.
+type SectionService struct {
+	db *sqlx.DB
+}
+
+// NewSectionService wires the service.
+func NewSectionService(db *sqlx.DB) *SectionService {
+	return &SectionService{db: db}
+}
+
+// ErrSubmissionSectionNotFound is the sentinel for "no section with
+// that id visible to this user".
+var ErrSubmissionSectionNotFound = errors.New("submission section: not found")
+
+const sectionColumns = `id, draft_id, section_key, order_index, kind,
+                        label_de, label_en, included,
+                        content_md_de, content_md_en,
+                        created_at, updated_at`
+
+// ListForDraft returns every section row for a draft, ordered by
+// order_index ASC. Caller is responsible for the visibility gate
+// (SubmissionDraftService.Get returns ErrSubmissionDraftNotFound for
+// un-visible drafts, which the handler maps to 404). RLS in mig 148
+// additionally enforces owner-scope at the DB layer.
+func (s *SectionService) ListForDraft(ctx context.Context, draftID uuid.UUID) ([]SubmissionSection, error) {
+	var rows []SubmissionSection
+	err := s.db.SelectContext(ctx, &rows,
+		`SELECT `+sectionColumns+`
+		   FROM paliad.submission_sections
+		  WHERE draft_id = $1
+		  ORDER BY order_index ASC`,
+		draftID)
+	if err != nil {
+		return nil, fmt.Errorf("list submission sections: %w", err)
+	}
+	return rows, nil
+}
+
+// Get returns one section by id. Visibility gate is the caller's
+// responsibility — Slice A handlers wrap this with a SubmissionDraftService.Get
+// to enforce owner+can_see_project before exposing the section.
+func (s *SectionService) Get(ctx context.Context, sectionID uuid.UUID) (*SubmissionSection, error) {
+	var sec SubmissionSection
+	err := s.db.GetContext(ctx, &sec,
+		`SELECT `+sectionColumns+`
+		   FROM paliad.submission_sections
+		  WHERE id = $1`,
+		sectionID)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrSubmissionSectionNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("get submission section: %w", err)
+	}
+	return &sec, nil
+}
+
+// SectionPatch carries optional fields for an Update call. nil pointer
+// = "no change"; non-nil = "set to this".
+type SectionPatch struct {
+	ContentMDDE *string
+	ContentMDEN *string
+	Included    *bool
+	LabelDE     *string
+	LabelEN     *string
+	OrderIndex  *int
+}
+
+// Update applies a patch to one section row. Visibility is the caller's
+// responsibility — handlers wrap with SubmissionDraftService.Get for
+// owner-scoped checks. The DB-level RLS policy mirrors that check.
+//
+// Returns the refreshed row. ErrSubmissionSectionNotFound when the
+// section doesn't exist or the calling owner can't see it (RLS
+// filters at the SELECT step).
+func (s *SectionService) Update(ctx context.Context, sectionID uuid.UUID, patch SectionPatch) (*SubmissionSection, error) {
+	setParts := []string{}
+	args := []any{}
+	idx := 1
+
+	if patch.ContentMDDE != nil {
+		setParts = append(setParts, fmt.Sprintf("content_md_de = $%d", idx))
+		args = append(args, *patch.ContentMDDE)
+		idx++
+	}
+	if patch.ContentMDEN != nil {
+		setParts = append(setParts, fmt.Sprintf("content_md_en = $%d", idx))
+		args = append(args, *patch.ContentMDEN)
+		idx++
+	}
+	if patch.Included != nil {
+		setParts = append(setParts, fmt.Sprintf("included = $%d", idx))
+		args = append(args, *patch.Included)
+		idx++
+	}
+	if patch.LabelDE != nil {
+		setParts = append(setParts, fmt.Sprintf("label_de = $%d", idx))
+		args = append(args, *patch.LabelDE)
+		idx++
+	}
+	if patch.LabelEN != nil {
+		setParts = append(setParts, fmt.Sprintf("label_en = $%d", idx))
+		args = append(args, *patch.LabelEN)
+		idx++
+	}
+	if patch.OrderIndex != nil {
+		setParts = append(setParts, fmt.Sprintf("order_index = $%d", idx))
+		args = append(args, *patch.OrderIndex)
+		idx++
+	}
+
+	if len(setParts) == 0 {
+		return s.Get(ctx, sectionID)
+	}
+
+	args = append(args, sectionID)
+	q := fmt.Sprintf(
+		`UPDATE paliad.submission_sections
+		    SET %s
+		  WHERE id = $%d
+		  RETURNING `+sectionColumns,
+		strings.Join(setParts, ", "), idx,
+	)
+
+	var sec SubmissionSection
+	err := s.db.GetContext(ctx, &sec, q, args...)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrSubmissionSectionNotFound
+	}
+	if err != nil {
+		return nil, fmt.Errorf("update submission section: %w", err)
+	}
+	return &sec, nil
+}
+
+// SeedFromSpec inserts one row per BaseSectionSpec.Default into
+// submission_sections for the given draft. Runs inside the caller's
+// transaction (the SubmissionDraftService.Create path wraps the
+// draft INSERT + section seed in one tx so a failed seed rolls back
+// the draft too).
+//
+// Idempotent at the row level — UNIQUE (draft_id, section_key) returns
+// an error if the seed runs twice for the same draft, which is the
+// desired safety net (we never want to silently double-seed).
+//
+// Per the Q10 ratification: every kind is one of prose | requests |
+// evidence — there is no *_auto kind. Caption/letterhead/signature
+// sections are regular prose rows seeded with bag-driven Markdown.
+func (s *SectionService) SeedFromSpec(ctx context.Context, tx *sqlx.Tx, draftID uuid.UUID, spec BaseSectionSpec) error {
+	if len(spec.Defaults) == 0 {
+		return nil
+	}
+	for _, d := range spec.Defaults {
+		_, err := tx.ExecContext(ctx,
+			`INSERT INTO paliad.submission_sections
+			     (draft_id, section_key, order_index, kind,
+			      label_de, label_en, included,
+			      content_md_de, content_md_en)
+			 VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)`,
+			draftID, d.SectionKey, d.OrderIndex, d.Kind,
+			d.LabelDE, d.LabelEN, d.Included,
+			d.SeedMDDE, d.SeedMDEN)
+		if err != nil {
+			return fmt.Errorf("seed submission section %s: %w", d.SectionKey, err)
+		}
+	}
+	return nil
+}

internal/services/submission_section_service_live_test.go

@@ -0,0 +1,178 @@
+package services
+
+// Live-DB integration tests for the Composer seeding flow (t-paliad-313
+// Slice A). Skipped when TEST_DATABASE_URL is unset, mirroring the
+// other live-DB tests (see cansee_test.go for the bootstrap pattern).
+//
+// Covers:
+//   1. Mig 146 seeded the catalog: hlc-letterhead + neutral both
+//      resolve via GetBySlug and carry 10 section defaults each.
+//   2. BaseService.GetDefaultForCode picks the firm-matched base for a
+//      canonical submission_code (e.g. de.inf.lg.erwidg) — Slice A
+//      contract that drives new-draft seeding.
+//   3. SubmissionDraftService.Create on a fresh draft seeds base_id +
+//      10 submission_sections rows in one transaction, with order_index
+//      ascending and bilingual labels populated.
+
+import (
+	"context"
+	"os"
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+	_ "github.com/lib/pq"
+
+	"mgit.msbls.de/m/paliad/internal/db"
+)
+
+func TestComposerSeedFlow(t *testing.T) {
+	url := os.Getenv("TEST_DATABASE_URL")
+	if url == "" {
+		t.Skip("TEST_DATABASE_URL not set — skipping live DB test")
+	}
+	if err := db.ApplyMigrations(url); err != nil {
+		t.Fatalf("apply migrations: %v", err)
+	}
+	pool, err := sqlx.Connect("postgres", url)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	defer pool.Close()
+
+	ctx := context.Background()
+
+	bases := NewBaseService(pool)
+
+	t.Run("seed catalog: hlc-letterhead has 10 default sections", func(t *testing.T) {
+		b, err := bases.GetBySlug(ctx, "hlc-letterhead")
+		if err != nil {
+			t.Fatalf("GetBySlug(hlc-letterhead): %v", err)
+		}
+		if got := len(b.SectionSpec.Defaults); got != 10 {
+			t.Errorf("len(Defaults) = %d; want 10", got)
+		}
+		if b.SectionSpec.Stylemap["heading_1"] != "HLpat-Heading-H1" {
+			t.Errorf("Stylemap[heading_1] = %q; want HLpat-Heading-H1", b.SectionSpec.Stylemap["heading_1"])
+		}
+		// Verify the section order is strictly ascending.
+		prev := 0
+		for _, d := range b.SectionSpec.Defaults {
+			if d.OrderIndex <= prev {
+				t.Errorf("non-ascending order_index: %d (prev=%d) at %s", d.OrderIndex, prev, d.SectionKey)
+			}
+			prev = d.OrderIndex
+		}
+	})
+
+	t.Run("seed catalog: neutral exists with universal stylemap", func(t *testing.T) {
+		b, err := bases.GetBySlug(ctx, "neutral")
+		if err != nil {
+			t.Fatalf("GetBySlug(neutral): %v", err)
+		}
+		if b.SectionSpec.Stylemap["heading_1"] != "Heading 1" {
+			t.Errorf("neutral Stylemap[heading_1] = %q; want \"Heading 1\"", b.SectionSpec.Stylemap["heading_1"])
+		}
+	})
+
+	t.Run("GetDefaultForCode firm match", func(t *testing.T) {
+		// HLC + de.inf.lg.erwidg → hlc-letterhead (firm-matched).
+		b, err := bases.GetDefaultForCode(ctx, "HLC", "de.inf.lg.erwidg")
+		if err != nil {
+			t.Fatalf("GetDefaultForCode HLC: %v", err)
+		}
+		if b.Slug != "hlc-letterhead" {
+			t.Errorf("Slug = %q; want hlc-letterhead", b.Slug)
+		}
+	})
+
+	t.Run("GetDefaultForCode falls back to neutral when no firm hint", func(t *testing.T) {
+		b, err := bases.GetDefaultForCode(ctx, "", "de.inf.lg.erwidg")
+		if err != nil {
+			t.Fatalf("GetDefaultForCode no-firm: %v", err)
+		}
+		// Without a firm hint, the fallback chain skips firm-matched
+		// queries and lands on the firm-NULL neutral base.
+		if b.Slug != "neutral" {
+			t.Errorf("Slug = %q; want neutral (firm-NULL fallback)", b.Slug)
+		}
+	})
+
+	// Section seeding via SubmissionDraftService.Create — exercises the
+	// transactional INSERT path. Requires a real auth.users + paliad.users
+	// row because submission_drafts.user_id is FK-constrained.
+	t.Run("SubmissionDraftService.Create seeds 10 section rows", func(t *testing.T) {
+		userID := uuid.New()
+		cleanup := func() {
+			pool.ExecContext(ctx, `DELETE FROM paliad.submission_sections WHERE draft_id IN (SELECT id FROM paliad.submission_drafts WHERE user_id = $1)`, userID)
+			pool.ExecContext(ctx, `DELETE FROM paliad.submission_drafts   WHERE user_id = $1`, userID)
+			pool.ExecContext(ctx, `DELETE FROM paliad.users               WHERE id = $1`, userID)
+			pool.ExecContext(ctx, `DELETE FROM auth.users                 WHERE id = $1`, userID)
+		}
+		cleanup()
+		defer cleanup()
+
+		email := "composer-seed-" + userID.String()[:8] + "@hlc.com"
+		if _, err := pool.ExecContext(ctx, `INSERT INTO auth.users (id, email) VALUES ($1, $2)`, userID, email); err != nil {
+			t.Fatalf("seed auth.users: %v", err)
+		}
+		if _, err := pool.ExecContext(ctx,
+			`INSERT INTO paliad.users (id, email, display_name, office, global_role, lang)
+			 VALUES ($1, $2, 'Composer Seed', 'munich', 'standard', 'de')`,
+			userID, email); err != nil {
+			t.Fatalf("seed paliad.users: %v", err)
+		}
+
+		users := NewUserService(pool)
+		projects := NewProjectService(pool, users)
+		parties := NewPartyService(pool, projects)
+		vars := NewSubmissionVarsService(pool, projects, parties, users)
+		renderer := NewSubmissionRenderer()
+		drafts := NewSubmissionDraftService(pool, projects, vars, renderer)
+		sections := NewSectionService(pool)
+		drafts.AttachComposer(bases, sections, "HLC")
+
+		d, err := drafts.Create(ctx, userID, nil, "de.inf.lg.erwidg", "de")
+		if err != nil {
+			t.Fatalf("Create: %v", err)
+		}
+		if d.BaseID == nil {
+			t.Fatalf("BaseID = nil; want seeded base reference")
+		}
+		// hlc-letterhead is the firm default for HLC.
+		base, _ := bases.GetByID(ctx, *d.BaseID)
+		if base == nil || base.Slug != "hlc-letterhead" {
+			t.Errorf("seeded base slug = %v; want hlc-letterhead", base)
+		}
+
+		secs, err := sections.ListForDraft(ctx, d.ID)
+		if err != nil {
+			t.Fatalf("ListForDraft: %v", err)
+		}
+		if len(secs) != 10 {
+			t.Errorf("section count = %d; want 10", len(secs))
+		}
+		// Verify section_key set + bilingual labels populated.
+		wantKeys := map[string]bool{
+			"letterhead": false, "caption": false, "introduction": false,
+			"requests": false, "facts": false, "legal_argument": false,
+			"evidence": false, "exhibits": false, "closing": false, "signature": false,
+		}
+		prev := 0
+		for _, sec := range secs {
+			wantKeys[sec.SectionKey] = true
+			if sec.OrderIndex <= prev {
+				t.Errorf("non-ascending order_index: %d (prev=%d) at %s", sec.OrderIndex, prev, sec.SectionKey)
+			}
+			prev = sec.OrderIndex
+			if sec.LabelDE == "" || sec.LabelEN == "" {
+				t.Errorf("section %s missing bilingual label: de=%q en=%q", sec.SectionKey, sec.LabelDE, sec.LabelEN)
+			}
+		}
+		for k, seen := range wantKeys {
+			if !seen {
+				t.Errorf("missing seeded section_key: %s", k)
+			}
+		}
+	})
+}

internal/services/submission_vars.go

@@ -243,7 +243,7 @@ func (s *SubmissionVarsService) loadPublishedRule(ctx context.Context, submissio
 	var rule models.DeadlineRule
 	err := s.db.GetContext(ctx, &rule,
 		`SELECT `+ruleColumns+`
-		   FROM paliad.deadline_rules
+		   FROM paliad.deadline_rules_unified
 		  WHERE submission_code = $1
 		    AND lifecycle_state = 'published'
 		    AND is_active = true

pkg/litigationplanner/appeal_role.go

@@ -0,0 +1,58 @@
+package litigationplanner
+
+// AppealRole* are the canonical filer-role slugs used by the unified
+// upc.apl Berufung proceeding (t-paliad-307 / m/paliad#136 Bug 1).
+//
+// Every appeal filing rule carries primary_party='both' in the catalog
+// (either party could be the appellant, depending on which side lost
+// downstream), so the static primary_party column can't drive
+// column-bucketing under a user-perspective `?side=` pick. The
+// per-rule appeal role fills that gap: "appellant" rules are filed by
+// the Berufungskläger (the party who lost in the lower instance and
+// is now appealing); "appellee" rules are filed by the
+// Berufungsbeklagter (the party defending the lower-instance
+// decision). The mapping is rule-semantic, not data-driven — we know
+// from R.224/235 which submission belongs to which side.
+const (
+	AppealRoleAppellant = "appellant"
+	AppealRoleAppellee  = "appellee"
+)
+
+// AppealFilerRole returns the appeal-filer role for a submission code
+// in the unified upc.apl proceeding. Empty string for codes whose role
+// is not statically known (court-issued events, unmapped codes, or
+// non-appeal proceedings).
+//
+// The engine stamps TimelineEntry.AppealRole with this value when
+// CalcOptions.AppealTarget is set so the frontend column-bucketer can
+// route each "both"-party rule into the correct user-perspective
+// column (Berufungskläger vs Berufungsbeklagter) once the user picks
+// a side.
+//
+// Adding a new appeal rule? Add its submission_code to the matching
+// branch below. Court-issued events (cost.decision, order.order,
+// merits.oral, merits.decision) deliberately stay empty — they route
+// to the court column on primary_party='court'.
+func AppealFilerRole(submissionCode string) string {
+	switch submissionCode {
+	// Appellant filings — Berufungskläger initiates the appeal +
+	// replies to the cross-appeal.
+	case "upc.apl.merits.notice",
+		"upc.apl.merits.grounds",
+		"upc.apl.merits.cross_a_reply",
+		"upc.apl.cost.leave_app",
+		"upc.apl.order.with_leave",
+		"upc.apl.order.grounds_orders",
+		"upc.apl.order.discretion",
+		"upc.apl.order.cross_reply":
+		return AppealRoleAppellant
+	// Appellee filings — Berufungsbeklagter responds to the appeal +
+	// files the cross-appeal.
+	case "upc.apl.merits.response",
+		"upc.apl.merits.cross_a",
+		"upc.apl.order.response_orders",
+		"upc.apl.order.cross":
+		return AppealRoleAppellee
+	}
+	return ""
+}

pkg/litigationplanner/appeal_role_test.go

@@ -0,0 +1,192 @@
+package litigationplanner
+
+import (
+	"context"
+	"testing"
+
+	"github.com/google/uuid"
+)
+
+// TestAppealFilerRole pins the rule-semantic mapping that drives
+// column-bucketing on the unified upc.apl Berufung timeline
+// (t-paliad-307 / m/paliad#136 Bug 1). Every appeal filing rule has
+// primary_party='both' in the catalog so the bucketer can't decide
+// between Berufungskläger and Berufungsbeklagter columns from
+// primary_party alone — the appeal role fills that gap.
+func TestAppealFilerRole(t *testing.T) {
+	cases := []struct {
+		code string
+		want string
+	}{
+		// Appellant filings (Berufungskläger initiates / replies to cross).
+		{"upc.apl.merits.notice", AppealRoleAppellant},
+		{"upc.apl.merits.grounds", AppealRoleAppellant},
+		{"upc.apl.merits.cross_a_reply", AppealRoleAppellant},
+		{"upc.apl.cost.leave_app", AppealRoleAppellant},
+		{"upc.apl.order.with_leave", AppealRoleAppellant},
+		{"upc.apl.order.grounds_orders", AppealRoleAppellant},
+		{"upc.apl.order.discretion", AppealRoleAppellant},
+		{"upc.apl.order.cross_reply", AppealRoleAppellant},
+		// Appellee filings (Berufungsbeklagter responds + cross-appeals).
+		{"upc.apl.merits.response", AppealRoleAppellee},
+		{"upc.apl.merits.cross_a", AppealRoleAppellee},
+		{"upc.apl.order.response_orders", AppealRoleAppellee},
+		{"upc.apl.order.cross", AppealRoleAppellee},
+		// Court-issued events stay empty — they route on party='court'.
+		{"upc.apl.merits.decision", ""},
+		{"upc.apl.merits.oral", ""},
+		{"upc.apl.cost.decision", ""},
+		{"upc.apl.order.order", ""},
+		// Unmapped codes are empty (defensive — never silently picks a
+		// side for a new appeal rule we forgot to map).
+		{"upc.inf.cfi.soc", ""},
+		{"", ""},
+		{"foo.bar", ""},
+	}
+	for _, c := range cases {
+		if got := AppealFilerRole(c.code); got != c.want {
+			t.Errorf("AppealFilerRole(%q) = %q, want %q", c.code, got, c.want)
+		}
+	}
+}
+
+// TestCalculate_AppealSyntheticTriggerRow exercises the synthetic root
+// row the engine prepends when CalcOptions.AppealTarget is set
+// (t-paliad-307 / m/paliad#136 Bug 2). The row carries the
+// per-appeal-target label, the trigger date as DueDate, IsRootEvent=
+// IsTriggerEvent=true, and party=court. Without the appeal_target
+// filter, no synthetic row is emitted (regression guard).
+func TestCalculate_AppealSyntheticTriggerRow(t *testing.T) {
+	ctx := context.Background()
+
+	jurisdiction := "UPC"
+	procID := 1
+	pt := ProceedingType{
+		ID:           procID,
+		Code:         "upc.apl.unified",
+		Name:         "Berufung",
+		NameEN:       "Appeal",
+		Jurisdiction: &jurisdiction,
+		IsActive:     true,
+	}
+
+	mkID := func() uuid.UUID {
+		id, _ := uuid.NewRandom()
+		return id
+	}
+	str := func(s string) *string { return &s }
+	procIDPtr := &procID
+
+	noticeCode := "upc.apl.merits.notice"
+	groundsCode := "upc.apl.merits.grounds"
+
+	rules := []Rule{
+		{
+			ID:               mkID(),
+			ProceedingTypeID: procIDPtr,
+			SubmissionCode:   &noticeCode,
+			Name:             "Berufungseinlegung",
+			NameEN:           "Notice of Appeal",
+			PrimaryParty:     str(PrimaryPartyBoth),
+			DurationValue:    2,
+			DurationUnit:     "months",
+			Timing:           str("after"),
+			SequenceOrder:    0,
+			IsActive:         true,
+			LifecycleState:   "published",
+			Priority:         "mandatory",
+			AppliesToTarget:  []string{AppealTargetEndentscheidung, AppealTargetSchadensbemessung},
+		},
+		{
+			ID:               mkID(),
+			ProceedingTypeID: procIDPtr,
+			SubmissionCode:   &groundsCode,
+			Name:             "Berufungsbegründung",
+			NameEN:           "Statement of Grounds",
+			PrimaryParty:     str(PrimaryPartyBoth),
+			DurationValue:    4,
+			DurationUnit:     "months",
+			Timing:           str("after"),
+			SequenceOrder:    1,
+			IsActive:         true,
+			LifecycleState:   "published",
+			Priority:         "mandatory",
+			AppliesToTarget:  []string{AppealTargetEndentscheidung, AppealTargetSchadensbemessung},
+		},
+	}
+
+	cat := &stubCatalog{pt: pt, rules: rules}
+
+	t.Run("with appeal_target — synthetic row prepended + appeal_role stamped", func(t *testing.T) {
+		opts := CalcOptions{AppealTarget: AppealTargetEndentscheidung}
+		timeline, err := Calculate(ctx, "upc.apl.unified", "2026-05-26", opts, cat, noOpHolidays{}, fixedCourts{})
+		if err != nil {
+			t.Fatalf("Calculate: %v", err)
+		}
+		if len(timeline.Deadlines) < 3 {
+			t.Fatalf("expected synthetic row + 2 rules, got %d rows", len(timeline.Deadlines))
+		}
+		// Synthetic row first.
+		first := timeline.Deadlines[0]
+		if !first.IsTriggerEvent {
+			t.Errorf("first row IsTriggerEvent=%v, want true", first.IsTriggerEvent)
+		}
+		if !first.IsRootEvent {
+			t.Errorf("first row IsRootEvent=%v, want true", first.IsRootEvent)
+		}
+		if first.Name != "Endentscheidung (R.118)" {
+			t.Errorf("first row Name=%q, want %q", first.Name, "Endentscheidung (R.118)")
+		}
+		if first.NameEN != "Final decision (R.118)" {
+			t.Errorf("first row NameEN=%q, want %q", first.NameEN, "Final decision (R.118)")
+		}
+		if first.DueDate != "2026-05-26" {
+			t.Errorf("first row DueDate=%q, want 2026-05-26", first.DueDate)
+		}
+		if first.Party != PrimaryPartyCourt {
+			t.Errorf("first row Party=%q, want court", first.Party)
+		}
+		// Real rules should carry AppealRole.
+		byCode := map[string]TimelineEntry{}
+		for _, d := range timeline.Deadlines {
+			byCode[d.Code] = d
+		}
+		if got := byCode[noticeCode].AppealRole; got != AppealRoleAppellant {
+			t.Errorf("notice AppealRole=%q, want appellant", got)
+		}
+		if got := byCode[groundsCode].AppealRole; got != AppealRoleAppellant {
+			t.Errorf("grounds AppealRole=%q, want appellant", got)
+		}
+	})
+
+	t.Run("without appeal_target — no synthetic row, no appeal_role", func(t *testing.T) {
+		opts := CalcOptions{}
+		timeline, err := Calculate(ctx, "upc.apl.unified", "2026-05-26", opts, cat, noOpHolidays{}, fixedCourts{})
+		if err != nil {
+			t.Fatalf("Calculate: %v", err)
+		}
+		for _, d := range timeline.Deadlines {
+			if d.IsTriggerEvent {
+				t.Errorf("unexpected synthetic trigger row when appeal_target is unset: %+v", d)
+			}
+			if d.AppealRole != "" {
+				t.Errorf("unexpected AppealRole=%q when appeal_target is unset (rule %q)", d.AppealRole, d.Code)
+			}
+		}
+	})
+
+	t.Run("unknown appeal_target — short-circuits to no-op", func(t *testing.T) {
+		opts := CalcOptions{AppealTarget: "bogus"}
+		timeline, err := Calculate(ctx, "upc.apl.unified", "2026-05-26", opts, cat, noOpHolidays{}, fixedCourts{})
+		if err != nil {
+			t.Fatalf("Calculate: %v", err)
+		}
+		// IsValidAppealTarget("bogus") = false, so the engine skips
+		// both the rule filter AND the synthetic trigger emission.
+		for _, d := range timeline.Deadlines {
+			if d.IsTriggerEvent {
+				t.Errorf("unexpected synthetic trigger row for unknown target: %+v", d)
+			}
+		}
+	})
+}

pkg/litigationplanner/appeal_target_label_test.go

@@ -0,0 +1,55 @@
+package litigationplanner
+
+import "testing"
+
+// TestTriggerEventLabelForAppealTarget pins the per-target trigger-
+// event label matrix (t-paliad-301 / m/paliad#132 Bug B). The 5
+// canonical AppealTargets each have a DE + EN label; unknown targets
+// return empty so the caller can fall back to the proceeding's own
+// trigger_event_label.
+func TestTriggerEventLabelForAppealTarget(t *testing.T) {
+	cases := []struct {
+		target string
+		lang   string
+		want   string
+	}{
+		{AppealTargetEndentscheidung, "de", "Endentscheidung (R.118)"},
+		{AppealTargetEndentscheidung, "en", "Final decision (R.118)"},
+		{AppealTargetKostenentscheidung, "de", "Kostenentscheidung"},
+		{AppealTargetKostenentscheidung, "en", "Cost decision"},
+		{AppealTargetAnordnung, "de", "Anordnung"},
+		{AppealTargetAnordnung, "en", "Order"},
+		{AppealTargetSchadensbemessung, "de", "Entscheidung im Schadensbemessungsverfahren"},
+		{AppealTargetSchadensbemessung, "en", "Damages-assessment decision"},
+		{AppealTargetBucheinsicht, "de", "Anordnung der Bucheinsicht"},
+		{AppealTargetBucheinsicht, "en", "Book-inspection order"},
+		// Unknown lang falls through to DE so the caller never gets
+		// an empty string for a known target.
+		{AppealTargetEndentscheidung, "fr", "Endentscheidung (R.118)"},
+		// Unknown target → empty so caller falls back to proceeding's
+		// trigger_event_label.
+		{"", "de", ""},
+		{"foo", "en", ""},
+	}
+	for _, c := range cases {
+		if got := TriggerEventLabelForAppealTarget(c.target, c.lang); got != c.want {
+			t.Errorf("TriggerEventLabelForAppealTarget(%q, %q) = %q, want %q",
+				c.target, c.lang, got, c.want)
+		}
+	}
+}
+
+// TestAppealTargetsCoverage ensures every entry in AppealTargets has
+// a non-empty label in both languages. Adding a target to the slice
+// without populating the switch would silently emit empty labels —
+// this test catches that.
+func TestAppealTargetsCoverage(t *testing.T) {
+	for _, target := range AppealTargets {
+		for _, lang := range []string{"de", "en"} {
+			if got := TriggerEventLabelForAppealTarget(target, lang); got == "" {
+				t.Errorf("AppealTarget %q has empty label for lang %q — add it to the switch",
+					target, lang)
+			}
+		}
+	}
+}

pkg/litigationplanner/before_court_set_anchor_test.go

@@ -0,0 +1,328 @@
+package litigationplanner
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// Regression test for t-paliad-304 / m/paliad#135.
+//
+// Reproduces the R.109.1 / R.109.4 anchor bug on upc.inf.cfi:
+//   - Trigger (Klageerhebung):   parent_id=nil, duration=0,  !IsCourtSet, sequence_order=0
+//   - Translation request:       parent_id=oral, duration=1mo before, sequence_order=45
+//   - Interpreter cost:          parent_id=oral, duration=2w before, sequence_order=46
+//   - Oral hearing:              parent_id=nil, duration=0,  IsCourtSet, sequence_order=50
+//
+// The "before" children are listed BEFORE the oral hearing in sequence
+// order (because chronologically they happen before it). The engine walks
+// rules in sequence_order, so when it processes the translation/
+// interpreter rows, the oral hearing has not yet been processed →
+// courtSet[oral.ID] is not yet set → parentIsCourtSet is false → the
+// engine falls back to the trigger date as the base. Result: the timing=
+// 'before' arithmetic produces 27.04.2026 (1mo before SoC) instead of
+// the conditional-no-date treatment that a court-set parent should
+// trigger.
+//
+// Expected post-fix: translation_request + interpreter_cost render as
+// IsConditional (no concrete date) because their parent's date is
+// court-set and the proceeding does not yet have an explicit override.
+
+// stubCatalog implements lp.Catalog backed by an in-memory rule slice.
+// Only LoadProceeding is needed for the engine path under test; the
+// other interface methods return errors so an unintended call surfaces
+// immediately.
+type stubCatalog struct {
+	pt    ProceedingType
+	rules []Rule
+}
+
+func (s *stubCatalog) LoadProceeding(_ context.Context, code string, _ ProjectHint) (*ProceedingType, []Rule, error) {
+	if code != s.pt.Code {
+		return nil, nil, ErrUnknownProceedingType
+	}
+	rules := make([]Rule, len(s.rules))
+	copy(rules, s.rules)
+	pt := s.pt
+	return &pt, rules, nil
+}
+func (s *stubCatalog) LoadProceedingByID(_ context.Context, _ int) (*ProceedingType, error) {
+	return nil, errors.New("stubCatalog.LoadProceedingByID: not implemented")
+}
+func (s *stubCatalog) LoadRuleByID(_ context.Context, _ string) (*Rule, error) {
+	return nil, errors.New("stubCatalog.LoadRuleByID: not implemented")
+}
+func (s *stubCatalog) LoadRuleByCode(_ context.Context, _, _ string) (*Rule, *ProceedingType, error) {
+	return nil, nil, errors.New("stubCatalog.LoadRuleByCode: not implemented")
+}
+func (s *stubCatalog) LoadRulesByTriggerEvent(_ context.Context, _ int64) ([]Rule, error) {
+	return nil, nil
+}
+func (s *stubCatalog) LoadTriggerEventsByIDs(_ context.Context, _ []int64) (map[int64]TriggerEvent, error) {
+	return map[int64]TriggerEvent{}, nil
+}
+func (s *stubCatalog) LookupEvents(_ context.Context, _ EventLookupAxes, _ EventLookupDepth) ([]EventMatch, error) {
+	return nil, nil
+}
+func (s *stubCatalog) LoadScenarios(_ context.Context, _ ScenarioFilter) ([]Scenario, error) {
+	return nil, nil
+}
+func (s *stubCatalog) MatchScenario(_ context.Context, _ uuid.UUID) (*Scenario, error) {
+	return nil, ErrUnknownScenario
+}
+
+// noOpHolidays never adjusts dates — the test fixture doesn't care about
+// weekends or holidays, only about which base date the engine resolves.
+type noOpHolidays struct{}
+
+func (noOpHolidays) IsNonWorkingDay(_ time.Time, _, _ string) bool { return false }
+func (noOpHolidays) AdjustForNonWorkingDays(d time.Time, _, _ string) (time.Time, time.Time, bool) {
+	return d, d, false
+}
+func (noOpHolidays) AdjustForNonWorkingDaysBackward(d time.Time, _, _ string) (time.Time, time.Time, bool) {
+	return d, d, false
+}
+func (noOpHolidays) AdjustForNonWorkingDaysWithReason(d time.Time, _, _ string) (time.Time, time.Time, bool, *AdjustmentReason) {
+	return d, d, false, nil
+}
+
+type fixedCourts struct{}
+
+func (fixedCourts) CountryRegime(_, _, _ string) (string, string, error) {
+	return CountryDE, RegimeUPC, nil
+}
+
+func TestCalculate_BeforeChildOfCourtSetParent_OutOfOrderSequence(t *testing.T) {
+	ctx := context.Background()
+
+	// proceeding metadata
+	jurisdiction := "UPC"
+	procID := 1
+	pt := ProceedingType{
+		ID:           procID,
+		Code:         "upc.inf.cfi",
+		Name:         "Verletzungsverfahren",
+		NameEN:       "Infringement",
+		Jurisdiction: &jurisdiction,
+		IsActive:     true,
+	}
+
+	mkID := func() uuid.UUID {
+		id, _ := uuid.NewRandom()
+		return id
+	}
+	str := func(s string) *string { return &s }
+	procIDPtr := &procID
+
+	socID := mkID()
+	oralID := mkID()
+	transID := mkID()
+	interpID := mkID()
+
+	socCode := "upc.inf.cfi.soc"
+	oralCode := "upc.inf.cfi.oral"
+	transCode := "upc.inf.cfi.translation_request"
+	interpCode := "upc.inf.cfi.interpreter_cost"
+
+	rules := []Rule{
+		{
+			ID:               socID,
+			ProceedingTypeID: procIDPtr,
+			ParentID:         nil,
+			SubmissionCode:   &socCode,
+			Name:             "Klageerhebung",
+			NameEN:           "Statement of Claim",
+			PrimaryParty:     str("claimant"),
+			DurationValue:    0,
+			DurationUnit:     "months",
+			Timing:           str("after"),
+			SequenceOrder:    0,
+			IsCourtSet:       false,
+			IsActive:         true,
+			LifecycleState:   "published",
+			Priority:         "mandatory",
+		},
+		// Translation request: sequence_order BEFORE the oral hearing.
+		// Reproduces the real corpus ordering (DB rows 45 < 50).
+		{
+			ID:               transID,
+			ProceedingTypeID: procIDPtr,
+			ParentID:         &oralID,
+			SubmissionCode:   &transCode,
+			Name:             "Antrag auf Simultanübersetzung",
+			NameEN:           "Translation request",
+			PrimaryParty:     str("both"),
+			DurationValue:    1,
+			DurationUnit:     "months",
+			Timing:           str("before"),
+			SequenceOrder:    45,
+			IsCourtSet:       false,
+			IsActive:         true,
+			LifecycleState:   "published",
+			Priority:         "optional",
+		},
+		// Interpreter cost notice: sequence_order BEFORE the oral hearing.
+		{
+			ID:               interpID,
+			ProceedingTypeID: procIDPtr,
+			ParentID:         &oralID,
+			SubmissionCode:   &interpCode,
+			Name:             "Mitteilung Dolmetscherkosten",
+			NameEN:           "Interpreter cost notice",
+			PrimaryParty:     str("court"),
+			DurationValue:    2,
+			DurationUnit:     "weeks",
+			Timing:           str("before"),
+			SequenceOrder:    46,
+			IsCourtSet:       false,
+			IsActive:         true,
+			LifecycleState:   "published",
+			Priority:         "mandatory",
+		},
+		// Oral hearing: court-set, no calculable date. Listed AFTER its
+		// "before"-timed children in sequence_order.
+		{
+			ID:               oralID,
+			ProceedingTypeID: procIDPtr,
+			ParentID:         nil,
+			SubmissionCode:   &oralCode,
+			Name:             "Mündliche Verhandlung",
+			NameEN:           "Oral hearing",
+			PrimaryParty:     str("court"),
+			DurationValue:    0,
+			DurationUnit:     "months",
+			Timing:           str("after"),
+			SequenceOrder:    50,
+			IsCourtSet:       true,
+			IsActive:         true,
+			LifecycleState:   "published",
+			Priority:         "mandatory",
+		},
+	}
+
+	cat := &stubCatalog{pt: pt, rules: rules}
+
+	timeline, err := Calculate(ctx, "upc.inf.cfi", "2026-05-26", CalcOptions{}, cat, noOpHolidays{}, fixedCourts{})
+	if err != nil {
+		t.Fatalf("Calculate: %v", err)
+	}
+
+	byCode := make(map[string]TimelineEntry, len(timeline.Deadlines))
+	for _, d := range timeline.Deadlines {
+		byCode[d.Code] = d
+	}
+
+	// The trigger event itself is unambiguous.
+	if got := byCode[socCode]; got.DueDate != "2026-05-26" || !got.IsRootEvent {
+		t.Errorf("SoC: DueDate=%q IsRootEvent=%v, want 2026-05-26 + IsRootEvent=true", got.DueDate, got.IsRootEvent)
+	}
+
+	// Oral hearing must surface as IsCourtSet (no date).
+	oral := byCode[oralCode]
+	if oral.DueDate != "" || !oral.IsCourtSet {
+		t.Errorf("oral: DueDate=%q IsCourtSet=%v, want empty + IsCourtSet=true", oral.DueDate, oral.IsCourtSet)
+	}
+
+	// The two "before" children of the court-set oral hearing MUST surface
+	// as conditional rows (no date, no fabricated arithmetic off the
+	// trigger date). The buggy behaviour produces 2026-04-27 and 2026-05-12.
+	trans := byCode[transCode]
+	if trans.DueDate != "" {
+		t.Errorf("translation_request: DueDate=%q, want empty (parent oral is court-set, no anchor known yet)", trans.DueDate)
+	}
+	if !trans.IsConditional && !trans.IsCourtSet {
+		t.Errorf("translation_request: IsConditional=%v IsCourtSet=%v, want at least one true", trans.IsConditional, trans.IsCourtSet)
+	}
+
+	interp := byCode[interpCode]
+	if interp.DueDate != "" {
+		t.Errorf("interpreter_cost: DueDate=%q, want empty (parent oral is court-set, no anchor known yet)", interp.DueDate)
+	}
+	if !interp.IsConditional && !interp.IsCourtSet {
+		t.Errorf("interpreter_cost: IsConditional=%v IsCourtSet=%v, want at least one true", interp.IsConditional, interp.IsCourtSet)
+	}
+}
+
+// TestCalculate_BeforeChildOfCourtSetParent_WithOverride pins the
+// override semantics: when the user supplies an anchor override for
+// the court-set parent, the "before" children should compute against
+// that override date instead of remaining conditional.
+func TestCalculate_BeforeChildOfCourtSetParent_WithOverride(t *testing.T) {
+	ctx := context.Background()
+
+	jurisdiction := "UPC"
+	procID := 1
+	pt := ProceedingType{
+		ID:           procID,
+		Code:         "upc.inf.cfi",
+		Name:         "Verletzungsverfahren",
+		Jurisdiction: &jurisdiction,
+		IsActive:     true,
+	}
+
+	mkID := func() uuid.UUID {
+		id, _ := uuid.NewRandom()
+		return id
+	}
+	str := func(s string) *string { return &s }
+	procIDPtr := &procID
+
+	socID := mkID()
+	oralID := mkID()
+	transID := mkID()
+
+	socCode := "upc.inf.cfi.soc"
+	oralCode := "upc.inf.cfi.oral"
+	transCode := "upc.inf.cfi.translation_request"
+
+	rules := []Rule{
+		{
+			ID: socID, ProceedingTypeID: procIDPtr, ParentID: nil,
+			SubmissionCode: &socCode, Name: "Klageerhebung", NameEN: "SoC",
+			PrimaryParty: str("claimant"), DurationValue: 0, DurationUnit: "months", Timing: str("after"),
+			SequenceOrder: 0, IsActive: true, LifecycleState: "published", Priority: "mandatory",
+		},
+		{
+			ID: transID, ProceedingTypeID: procIDPtr, ParentID: &oralID,
+			SubmissionCode: &transCode, Name: "Antrag auf Simultanübersetzung", NameEN: "Translation request",
+			PrimaryParty: str("both"), DurationValue: 1, DurationUnit: "months", Timing: str("before"),
+			SequenceOrder: 45, IsActive: true, LifecycleState: "published", Priority: "optional",
+		},
+		{
+			ID: oralID, ProceedingTypeID: procIDPtr, ParentID: nil,
+			SubmissionCode: &oralCode, Name: "Mündliche Verhandlung", NameEN: "Oral hearing",
+			PrimaryParty: str("court"), DurationValue: 0, DurationUnit: "months", Timing: str("after"),
+			SequenceOrder: 50, IsCourtSet: true, IsActive: true, LifecycleState: "published", Priority: "mandatory",
+		},
+	}
+
+	cat := &stubCatalog{pt: pt, rules: rules}
+
+	// User pins the oral hearing to 2026-10-15.
+	opts := CalcOptions{
+		AnchorOverrides: map[string]string{
+			oralCode: "2026-10-15",
+		},
+	}
+	timeline, err := Calculate(ctx, "upc.inf.cfi", "2026-05-26", opts, cat, noOpHolidays{}, fixedCourts{})
+	if err != nil {
+		t.Fatalf("Calculate: %v", err)
+	}
+
+	byCode := make(map[string]TimelineEntry, len(timeline.Deadlines))
+	for _, d := range timeline.Deadlines {
+		byCode[d.Code] = d
+	}
+
+	if got := byCode[oralCode].DueDate; got != "2026-10-15" {
+		t.Errorf("oral: DueDate=%q, want 2026-10-15 (user override)", got)
+	}
+
+	// 1 month before 2026-10-15 = 2026-09-15
+	if got := byCode[transCode].DueDate; got != "2026-09-15" {
+		t.Errorf("translation_request: DueDate=%q, want 2026-09-15 (1 month before oral override)", got)
+	}
+}

pkg/litigationplanner/catalog.go

@@ -1,6 +1,10 @@
 package litigationplanner
 
-import "context"
+import (
+	"context"
+
+	"github.com/google/uuid"
+)
 
 // Catalog supplies proceeding-type metadata + rules for the calculator.
 //
@@ -59,4 +63,17 @@ type Catalog interface {
 	// (proceeding_type_id, sequence_order) so the frontend can render
 	// without re-sorting.
 	LookupEvents(ctx context.Context, axes EventLookupAxes, depth EventLookupDepth) ([]EventMatch, error)
+
+	// LoadScenarios lists scenarios visible to the caller, narrowed by
+	// the filter (Slice D, m/paliad#124 §5). Returns an empty slice
+	// (NOT an error) when no scenarios match. paliad-side impl applies
+	// RLS (paliad.can_see_project for project-scoped, created_by for
+	// abstract); snapshot-backed catalogs return an empty list.
+	LoadScenarios(ctx context.Context, filter ScenarioFilter) ([]Scenario, error)
+
+	// MatchScenario returns the scenario with the given id, or
+	// ErrUnknownScenario if not found / not visible. The engine adapter
+	// (CalculateFromScenario) calls this to fetch a scenario by id and
+	// then unpacks its spec via ParseSpec.
+	MatchScenario(ctx context.Context, id uuid.UUID) (*Scenario, error)
 }

pkg/litigationplanner/embedded/upc/snapshot.go

@@ -292,6 +292,20 @@ func (c *SnapshotCatalog) LookupEvents(_ context.Context, axes lp.EventLookupAxe
 	return out, nil
 }
 
+// LoadScenarios returns an empty slice. The snapshot catalog has no
+// scenarios — youpc.org (the consumer today) doesn't carry a project /
+// user model. Future snapshot variants could ship demo scenarios, but
+// v1 returns nothing.
+func (c *SnapshotCatalog) LoadScenarios(_ context.Context, _ lp.ScenarioFilter) ([]lp.Scenario, error) {
+	return []lp.Scenario{}, nil
+}
+
+// MatchScenario always returns ErrUnknownScenario — the snapshot has
+// no scenarios to match against.
+func (c *SnapshotCatalog) MatchScenario(_ context.Context, _ uuid.UUID) (*lp.Scenario, error) {
+	return nil, lp.ErrUnknownScenario
+}
+
 // Compile-time assertion that SnapshotCatalog satisfies lp.Catalog.
 var _ lp.Catalog = (*SnapshotCatalog)(nil)
 

pkg/litigationplanner/engine.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"sort"
 	"time"
 
 	"github.com/google/uuid"
@@ -183,10 +184,27 @@ func Calculate(
 		return nil, fmt.Errorf("load trigger events for conditional labels: %w", err)
 	}
 
-	// Walk the rule list in sequence_order (already sorted by the
-	// catalog query) and compute each entry, keeping a code→date map so
-	// RelativeTo / parent_id references resolve to the adjusted
-	// predecessor date.
+	// Walk the rule list in TOPOLOGICAL order (parents before children),
+	// not the raw sequence_order order from the catalog. The catalog
+	// returns rules sorted by sequence_order, which is the chronological/
+	// display order. That order is parent-first for the common
+	// timing='after' case but parent-LAST for timing='before' children
+	// (e.g. upc.inf.cfi.translation_request at seq=45 vs its parent
+	// upc.inf.cfi.oral at seq=50 — m/paliad#135). Without topological
+	// ordering the parent-state checks below (courtSet[parent] /
+	// computed[parent_code]) read stale empty maps when a child appears
+	// before its parent, and the engine falls back to the trigger date
+	// → fabricates dates before the SoC.
+	//
+	// Original sequence_order is restored at the end of the walk so the
+	// wire shape and the timeline view's render order stay identical to
+	// the legacy behaviour modulo the bug fix.
+	sequenceIndex := make(map[uuid.UUID]int, len(rules))
+	for i, r := range rules {
+		sequenceIndex[r.ID] = i
+	}
+	walkRules := topoSortByParentDepth(rules)
+
 	computed := make(map[string]time.Time, len(rules))
 	courtSet := make(map[uuid.UUID]bool, len(rules))
 	deadlines := make([]TimelineEntry, 0, len(rules))
@@ -197,7 +215,7 @@ func Calculate(
 	hiddenCount := 0
 	appellantContext := make(map[uuid.UUID]string, len(rules))
 
-	for _, r := range rules {
+	for _, r := range walkRules {
 		// Phase-3 unified gate: evaluate condition_expr (jsonb).
 		// Suppression semantic preserved: when the gate fires false
 		// AND no alt_* values exist, the rule is dropped from the
@@ -554,6 +572,35 @@ func Calculate(
 		deadlines = append(deadlines, d)
 	}
 
+	// Stamp AppealRole on every entry when an appeal-target filter is
+	// active so the frontend column-bucketer can route primary_party=
+	// 'both' rules into the user-perspective columns
+	// (Berufungskläger vs Berufungsbeklagter). Court events stay empty
+	// — they route on Party='court' regardless. (t-paliad-307 /
+	// m/paliad#136 Bug 1)
+	if opts.AppealTarget != "" && IsValidAppealTarget(opts.AppealTarget) {
+		for i := range deadlines {
+			if deadlines[i].Code == "" {
+				continue
+			}
+			deadlines[i].AppealRole = AppealFilerRole(deadlines[i].Code)
+		}
+	}
+
+	// Restore sequence_order on the output slice. The compute walk
+	// re-ordered rules topologically (parent-first) so the parent-state
+	// checks resolved correctly; the wire shape and the linear timeline
+	// view both rely on sequence_order being the surface render order.
+	// (m/paliad#135)
+	sort.SliceStable(deadlines, func(i, j int) bool {
+		a, errA := uuid.Parse(deadlines[i].RuleID)
+		b, errB := uuid.Parse(deadlines[j].RuleID)
+		if errA != nil || errB != nil {
+			return false
+		}
+		return sequenceIndex[a] < sequenceIndex[b]
+	})
+
 	// t-paliad-296: within consecutive runs of rules sharing the same
 	// trigger group (parent_id + trigger_event_id), reorder by duration
 	// ascending so optional events following the same anchor render in
@@ -562,6 +609,31 @@ func Calculate(
 	// same-group rows. Court-set / conditional rows sort LAST.
 	sortDeadlinesByDurationWithinTriggerGroup(deadlines, ruleByID)
 
+	// Synthetic trigger-event row for appeal timelines (t-paliad-307 /
+	// m/paliad#136 Bug 2). The decision being appealed (Endentscheidung
+	// R.118, Kostenentscheidung, Anordnung, …) isn't a rule in the
+	// upc.apl catalog — it's the anchor the user picked. Lawyers expect
+	// it to surface as the first row of the timeline so the chain reads
+	// decision → appeal filings → next decision. Emitted only when an
+	// appeal_target is in play and the helper returns a non-empty label.
+	if opts.AppealTarget != "" && IsValidAppealTarget(opts.AppealTarget) {
+		nameDE := TriggerEventLabelForAppealTarget(opts.AppealTarget, "de")
+		nameEN := TriggerEventLabelForAppealTarget(opts.AppealTarget, "en")
+		if nameDE != "" || nameEN != "" {
+			trig := TimelineEntry{
+				Name:           nameDE,
+				NameEN:         nameEN,
+				Party:          PrimaryPartyCourt,
+				Priority:       "informational",
+				DueDate:        triggerDateStr,
+				OriginalDate:   triggerDateStr,
+				IsRootEvent:    true,
+				IsTriggerEvent: true,
+			}
+			deadlines = append([]TimelineEntry{trig}, deadlines...)
+		}
+	}
+
 	resp := &Timeline{
 		ProceedingType:   pickedProceeding.Code,
 		ProceedingName:   pickedProceeding.Name,
@@ -578,6 +650,21 @@ func Calculate(
 	if pickedProceeding.TriggerEventLabelEN != nil {
 		resp.TriggerEventLabelEN = *pickedProceeding.TriggerEventLabelEN
 	}
+	// t-paliad-301 / m/paliad#132 Bug B — appeal_target-driven trigger
+	// label. When the request narrows to a specific appeal target, the
+	// "Auslösendes Ereignis" label describes the underlying decision
+	// (Endentscheidung / Kostenentscheidung / Anordnung /
+	// Schadensbemessung / Bucheinsicht) rather than the appeal
+	// proceeding itself. Overrides the proceeding's own
+	// trigger_event_label set above.
+	if opts.AppealTarget != "" {
+		if de := TriggerEventLabelForAppealTarget(opts.AppealTarget, "de"); de != "" {
+			resp.TriggerEventLabel = de
+		}
+		if en := TriggerEventLabelForAppealTarget(opts.AppealTarget, "en"); en != "" {
+			resp.TriggerEventLabelEN = en
+		}
+	}
 	if hasSubTrackNote {
 		resp.ContextualNote = subTrackNote.NoteDE
 		resp.ContextualNoteEN = subTrackNote.NoteEN
@@ -935,3 +1022,60 @@ func AllFlagsSet(required []string, set map[string]struct{}) bool {
 func WireFlagsFromPriority(priority string) (isMandatory, isOptional bool) {
 	return wireFlagsFromPriority(priority)
 }
+
+// topoSortByParentDepth returns a copy of `rules` ordered so every rule
+// appears after its parent_id ancestor. Ties (rules at the same depth)
+// preserve their input order — which the catalog returns in
+// sequence_order. Used by Calculate to ensure the parent-state checks
+// (courtSet[parent], computed[parent_code]) see populated entries even
+// when sequence_order lists a "before"-timed child BEFORE its parent
+// (e.g. upc.inf.cfi.translation_request at seq=45 with parent
+// upc.inf.cfi.oral at seq=50 — m/paliad#135).
+//
+// Rules whose parent_id is missing from the rule slice (cross-tree
+// references that the per-proceeding filter dropped) are treated as
+// depth 0 — they walk in their original sequence position.
+//
+// The algorithm is depth-via-memoised-recursion. Cycle protection: a
+// rule chain that revisits a node is broken at depth 0; production
+// data shouldn't contain cycles, but a corrupted catalog mustn't hang
+// the calculator.
+func topoSortByParentDepth(rules []Rule) []Rule {
+	byID := make(map[uuid.UUID]Rule, len(rules))
+	inSlice := make(map[uuid.UUID]bool, len(rules))
+	for _, r := range rules {
+		byID[r.ID] = r
+		inSlice[r.ID] = true
+	}
+
+	depth := make(map[uuid.UUID]int, len(rules))
+	var resolve func(id uuid.UUID, seen map[uuid.UUID]bool) int
+	resolve = func(id uuid.UUID, seen map[uuid.UUID]bool) int {
+		if d, ok := depth[id]; ok {
+			return d
+		}
+		if seen[id] {
+			depth[id] = 0
+			return 0
+		}
+		seen[id] = true
+		r, ok := byID[id]
+		if !ok || r.ParentID == nil || !inSlice[*r.ParentID] {
+			depth[id] = 0
+			return 0
+		}
+		d := resolve(*r.ParentID, seen) + 1
+		depth[id] = d
+		return d
+	}
+	for _, r := range rules {
+		resolve(r.ID, map[uuid.UUID]bool{})
+	}
+
+	out := make([]Rule, len(rules))
+	copy(out, rules)
+	sort.SliceStable(out, func(i, j int) bool {
+		return depth[out[i].ID] < depth[out[j].ID]
+	})
+	return out
+}

pkg/litigationplanner/scenarios.go

@@ -0,0 +1,215 @@
+package litigationplanner
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// Slice D scenarios — m/paliad#124 §5 (revised), mig 145.
+//
+// A Scenario is a named composition of existing proceedings + flags +
+// per-card choices + anchor dates. v1 ships with one primary proceeding
+// per scenario; the spec.proceedings[] array is architected to absorb
+// multi-peer compose (v2) without a schema migration.
+//
+// "users should not add their own rules" (m, t-paliad-301) — the spec
+// references existing rules by submission_code; it never creates new
+// ones. ValidateSpec checks every code/submission resolves against the
+// current catalog before a save is accepted.
+
+// Scenario is one row of paliad.scenarios. Wire shape doubles as the
+// API request/response payload for /api/scenarios.
+type Scenario struct {
+	ID          uuid.UUID  `db:"id"          json:"id"`
+	ProjectID   *uuid.UUID `db:"project_id"  json:"project_id,omitempty"`
+	Name        string     `db:"name"        json:"name"`
+	Description *string    `db:"description" json:"description,omitempty"`
+	// Spec carries the jsonb composition. Stored raw so we can ship
+	// shape evolutions without schema churn; ParseSpec gives the
+	// structured view.
+	Spec      NullableJSON `db:"spec"       json:"spec"`
+	CreatedBy *uuid.UUID   `db:"created_by" json:"created_by,omitempty"`
+	CreatedAt time.Time    `db:"created_at" json:"created_at"`
+	UpdatedAt time.Time    `db:"updated_at" json:"updated_at"`
+}
+
+// ScenarioSpec is the parsed view of Scenario.Spec. v1 = version 1.
+// Future shape changes bump the version; ParseSpec rejects unknown
+// versions so an old client doesn't silently misread a future-shape
+// scenario.
+type ScenarioSpec struct {
+	Version         int                 `json:"version"`
+	BaseTriggerDate string              `json:"base_trigger_date"`
+	Proceedings     []ScenarioProceeding `json:"proceedings"`
+}
+
+// ScenarioProceeding is one entry under spec.proceedings[]. v1 honours
+// exactly one with role="primary" (additional entries with role="peer"
+// are reserved for v2 multi-proceeding compose and silently ignored
+// by the engine today).
+type ScenarioProceeding struct {
+	Code                string                       `json:"code"`
+	Role                string                       `json:"role"` // "primary" | "peer" (v2)
+	TriggerDateOverride string                       `json:"trigger_date_override,omitempty"`
+	Flags               []string                     `json:"flags,omitempty"`
+	PerCardChoices      map[string]ScenarioCardChoice `json:"per_card_choices,omitempty"`
+	AnchorOverrides     map[string]string            `json:"anchor_overrides,omitempty"`
+	SkipRules           []string                     `json:"skip_rules,omitempty"`
+	AppealTarget        string                       `json:"appeal_target,omitempty"`
+}
+
+// ScenarioCardChoice is one entry under
+// spec.proceedings[*].per_card_choices. Mirrors the t-paliad-265 choice
+// kinds; not every kind is populated on every card.
+type ScenarioCardChoice struct {
+	Appellant  string `json:"appellant,omitempty"`
+	IncludeCCR *bool  `json:"include_ccr,omitempty"`
+	Skip       *bool  `json:"skip,omitempty"`
+}
+
+// Spec version constant.
+const ScenarioSpecVersion = 1
+
+// Sentinel errors for scenarios.
+var (
+	ErrUnknownScenario   = errors.New("unknown scenario")
+	ErrInvalidScenario   = errors.New("invalid scenario spec")
+	ErrScenarioNoPrimary = errors.New("scenario spec has no proceeding with role='primary'")
+)
+
+// ScenarioRole* are the canonical role slugs for ScenarioProceeding.Role.
+const (
+	ScenarioRolePrimary = "primary"
+	ScenarioRolePeer    = "peer"
+)
+
+// ParseSpec decodes Scenario.Spec into a structured ScenarioSpec. Used
+// by the engine adapter + the rule-editor preview. Surfaces a friendly
+// error wrapping ErrInvalidScenario on malformed JSON / unknown version
+// so the handler can map to a 400.
+func ParseSpec(raw NullableJSON) (*ScenarioSpec, error) {
+	if len(raw) == 0 {
+		return nil, fmt.Errorf("%w: spec is empty", ErrInvalidScenario)
+	}
+	var s ScenarioSpec
+	if err := json.Unmarshal([]byte(raw), &s); err != nil {
+		return nil, fmt.Errorf("%w: decode spec: %v", ErrInvalidScenario, err)
+	}
+	if s.Version != ScenarioSpecVersion {
+		return nil, fmt.Errorf("%w: spec.version=%d, want %d",
+			ErrInvalidScenario, s.Version, ScenarioSpecVersion)
+	}
+	return &s, nil
+}
+
+// PrimaryProceeding returns the entry from spec.proceedings[] with
+// role="primary". Returns ErrScenarioNoPrimary if absent — every spec
+// must carry exactly one primary entry. (Multiple primaries are also
+// rejected: the engine consumes one.)
+func (s *ScenarioSpec) PrimaryProceeding() (*ScenarioProceeding, error) {
+	var primary *ScenarioProceeding
+	for i := range s.Proceedings {
+		if s.Proceedings[i].Role == ScenarioRolePrimary {
+			if primary != nil {
+				return nil, fmt.Errorf("%w: multiple proceedings with role='primary'", ErrInvalidScenario)
+			}
+			primary = &s.Proceedings[i]
+		}
+	}
+	if primary == nil {
+		return nil, ErrScenarioNoPrimary
+	}
+	return primary, nil
+}
+
+// CalcOptionsFromSpec builds a CalcOptions from the scenario's primary
+// entry. The caller still needs the proceeding code + the trigger date,
+// both returned alongside.
+//
+// v1: only the primary entry is honoured. v2 will iterate over peer
+// entries; the multi-peer merge lives in the paliad-side
+// ProjectionService (one Calculate call per entry, merged + sorted by
+// date).
+func (s *ScenarioSpec) CalcOptionsFromSpec() (proceedingCode, triggerDate string, opts CalcOptions, err error) {
+	primary, err := s.PrimaryProceeding()
+	if err != nil {
+		return "", "", CalcOptions{}, err
+	}
+	td := s.BaseTriggerDate
+	if primary.TriggerDateOverride != "" {
+		td = primary.TriggerDateOverride
+	}
+	if td == "" {
+		return "", "", CalcOptions{}, fmt.Errorf("%w: no base_trigger_date and no per-proceeding override", ErrInvalidScenario)
+	}
+
+	perCardAppellant := make(map[string]string, len(primary.PerCardChoices))
+	skipRules := make(map[string]struct{}, len(primary.SkipRules))
+	includeCCRFor := make(map[string]struct{}, len(primary.PerCardChoices))
+	for code, choice := range primary.PerCardChoices {
+		if choice.Appellant != "" {
+			perCardAppellant[code] = choice.Appellant
+		}
+		if choice.IncludeCCR != nil && *choice.IncludeCCR {
+			includeCCRFor[code] = struct{}{}
+		}
+		if choice.Skip != nil && *choice.Skip {
+			skipRules[code] = struct{}{}
+		}
+	}
+	for _, code := range primary.SkipRules {
+		skipRules[code] = struct{}{}
+	}
+
+	return primary.Code, td, CalcOptions{
+		Flags:            primary.Flags,
+		AnchorOverrides:  primary.AnchorOverrides,
+		AppealTarget:     primary.AppealTarget,
+		PerCardAppellant: perCardAppellant,
+		SkipRules:        skipRules,
+		IncludeCCRFor:    includeCCRFor,
+	}, nil
+}
+
+// ScenarioFilter narrows Catalog.LoadScenarios. All fields optional:
+//
+//   - ProjectID non-nil: only scenarios attached to that project
+//     (project_id = filter.ProjectID).
+//   - AbstractForUser non-nil: only abstract scenarios (project_id IS
+//     NULL) created by that user.
+//   - Both nil: list every scenario the caller can see (RLS-gated).
+type ScenarioFilter struct {
+	ProjectID       *uuid.UUID
+	AbstractForUser *uuid.UUID
+}
+
+// CalculateFromScenario is the high-level engine entry for scenario-
+// driven rendering. Unpacks the spec, builds CalcOptions, and delegates
+// to Calculate.
+//
+// v1: surfaces only the primary proceeding's timeline. v2 multi-peer
+// expansion lives on the paliad-side ProjectionService (per-entry
+// Calculate + client-side merge); the package doesn't own that
+// orchestration.
+func CalculateFromScenario(
+	ctx context.Context,
+	scenario *Scenario,
+	catalog Catalog,
+	holidays HolidayCalendar,
+	courts CourtRegistry,
+) (*Timeline, error) {
+	spec, err := ParseSpec(scenario.Spec)
+	if err != nil {
+		return nil, err
+	}
+	code, triggerDate, opts, err := spec.CalcOptionsFromSpec()
+	if err != nil {
+		return nil, err
+	}
+	return Calculate(ctx, code, triggerDate, opts, catalog, holidays, courts)
+}

pkg/litigationplanner/scenarios_test.go

@@ -0,0 +1,207 @@
+package litigationplanner
+
+import (
+	"strings"
+	"testing"
+)
+
+// TestParseSpec_Roundtrip pins the spec-decoder contract: well-formed
+// jsonb with version=1 parses; unknown versions and malformed JSON
+// surface ErrInvalidScenario.
+func TestParseSpec_Roundtrip(t *testing.T) {
+	cases := []struct {
+		name    string
+		spec    string
+		wantErr bool
+	}{
+		{
+			"v1 primary-only",
+			`{"version":1,"base_trigger_date":"2026-05-26","proceedings":[{"code":"upc.inf.cfi","role":"primary"}]}`,
+			false,
+		},
+		{
+			"v1 with full primary entry",
+			`{"version":1,"base_trigger_date":"2026-05-26","proceedings":[
+				{"code":"upc.inf.cfi","role":"primary","flags":["with_ccr"],
+				 "anchor_overrides":{"inf.reply":"2026-08-15"},
+				 "skip_rules":["inf.r30_amend"]}
+			 ]}`,
+			false,
+		},
+		{
+			"v2 spec rejected — unknown version",
+			`{"version":2,"proceedings":[]}`,
+			true,
+		},
+		{
+			"empty spec",
+			``,
+			true,
+		},
+		{
+			"malformed json",
+			`{"version":1,"proceedings":[}`,
+			true,
+		},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			_, err := ParseSpec(NullableJSON(c.spec))
+			if c.wantErr && err == nil {
+				t.Errorf("ParseSpec(%s): want error, got nil", c.spec)
+			}
+			if !c.wantErr && err != nil {
+				t.Errorf("ParseSpec(%s): unexpected error %v", c.spec, err)
+			}
+		})
+	}
+}
+
+// TestScenarioSpec_PrimaryProceeding pins the "exactly one primary"
+// invariant: zero → ErrScenarioNoPrimary; multiple → ErrInvalidScenario.
+func TestScenarioSpec_PrimaryProceeding(t *testing.T) {
+	t.Run("zero primary → ErrScenarioNoPrimary", func(t *testing.T) {
+		s := &ScenarioSpec{
+			Version: 1,
+			Proceedings: []ScenarioProceeding{
+				{Code: "upc.inf.cfi", Role: ScenarioRolePeer},
+			},
+		}
+		_, err := s.PrimaryProceeding()
+		if err != ErrScenarioNoPrimary {
+			t.Errorf("want ErrScenarioNoPrimary, got %v", err)
+		}
+	})
+
+	t.Run("two primaries rejected", func(t *testing.T) {
+		s := &ScenarioSpec{
+			Version: 1,
+			Proceedings: []ScenarioProceeding{
+				{Code: "upc.inf.cfi", Role: ScenarioRolePrimary},
+				{Code: "upc.rev.cfi", Role: ScenarioRolePrimary},
+			},
+		}
+		_, err := s.PrimaryProceeding()
+		if err == nil || !strings.Contains(err.Error(), "multiple proceedings with role='primary'") {
+			t.Errorf("want multi-primary error, got %v", err)
+		}
+	})
+
+	t.Run("single primary picked", func(t *testing.T) {
+		s := &ScenarioSpec{
+			Version: 1,
+			Proceedings: []ScenarioProceeding{
+				{Code: "upc.inf.cfi", Role: ScenarioRolePeer},
+				{Code: "upc.rev.cfi", Role: ScenarioRolePrimary, Flags: []string{"with_amend"}},
+			},
+		}
+		p, err := s.PrimaryProceeding()
+		if err != nil {
+			t.Fatalf("PrimaryProceeding: %v", err)
+		}
+		if p.Code != "upc.rev.cfi" {
+			t.Errorf("primary code = %q, want upc.rev.cfi", p.Code)
+		}
+		if len(p.Flags) != 1 || p.Flags[0] != "with_amend" {
+			t.Errorf("primary.Flags = %v, want [with_amend]", p.Flags)
+		}
+	})
+}
+
+// TestScenarioSpec_CalcOptionsFromSpec covers the unpack from spec
+// jsonb into the CalcOptions the engine consumes. Pins:
+//   - base_trigger_date used when no per-proceeding override
+//   - trigger_date_override wins when set
+//   - flags + anchor_overrides + appeal_target passed through verbatim
+//   - per_card_choices unpacked into PerCardAppellant / SkipRules /
+//     IncludeCCRFor maps
+func TestScenarioSpec_CalcOptionsFromSpec(t *testing.T) {
+	includeTrue := true
+	skipTrue := true
+	s := &ScenarioSpec{
+		Version:         1,
+		BaseTriggerDate: "2026-05-26",
+		Proceedings: []ScenarioProceeding{{
+			Code:                "upc.inf.cfi",
+			Role:                ScenarioRolePrimary,
+			Flags:               []string{"with_ccr"},
+			AnchorOverrides:     map[string]string{"inf.reply": "2026-08-15"},
+			AppealTarget:        "endentscheidung",
+			SkipRules:           []string{"explicit_skip_code"},
+			PerCardChoices: map[string]ScenarioCardChoice{
+				"inf.r30_amend":   {Appellant: "claimant"},
+				"inf.rejoin":      {IncludeCCR: &includeTrue},
+				"inf.amend_other": {Skip: &skipTrue},
+			},
+		}},
+	}
+	code, td, opts, err := s.CalcOptionsFromSpec()
+	if err != nil {
+		t.Fatalf("CalcOptionsFromSpec: %v", err)
+	}
+	if code != "upc.inf.cfi" {
+		t.Errorf("code = %q, want upc.inf.cfi", code)
+	}
+	if td != "2026-05-26" {
+		t.Errorf("triggerDate = %q, want 2026-05-26", td)
+	}
+	if len(opts.Flags) != 1 || opts.Flags[0] != "with_ccr" {
+		t.Errorf("opts.Flags = %v, want [with_ccr]", opts.Flags)
+	}
+	if opts.AppealTarget != "endentscheidung" {
+		t.Errorf("opts.AppealTarget = %q, want endentscheidung", opts.AppealTarget)
+	}
+	if got := opts.AnchorOverrides["inf.reply"]; got != "2026-08-15" {
+		t.Errorf("opts.AnchorOverrides[inf.reply] = %q, want 2026-08-15", got)
+	}
+	if got := opts.PerCardAppellant["inf.r30_amend"]; got != "claimant" {
+		t.Errorf("opts.PerCardAppellant[inf.r30_amend] = %q, want claimant", got)
+	}
+	if _, ok := opts.IncludeCCRFor["inf.rejoin"]; !ok {
+		t.Error("opts.IncludeCCRFor missing inf.rejoin")
+	}
+	if _, ok := opts.SkipRules["inf.amend_other"]; !ok {
+		t.Error("opts.SkipRules missing inf.amend_other (from per_card_choices.skip)")
+	}
+	if _, ok := opts.SkipRules["explicit_skip_code"]; !ok {
+		t.Error("opts.SkipRules missing explicit_skip_code (from skip_rules[])")
+	}
+}
+
+// TestScenarioSpec_TriggerDateOverride pins the per-proceeding override
+// path (v2-ready — primary entry honours trigger_date_override too).
+func TestScenarioSpec_TriggerDateOverride(t *testing.T) {
+	s := &ScenarioSpec{
+		Version:         1,
+		BaseTriggerDate: "2026-05-26",
+		Proceedings: []ScenarioProceeding{{
+			Code:                "upc.inf.cfi",
+			Role:                ScenarioRolePrimary,
+			TriggerDateOverride: "2026-12-01",
+		}},
+	}
+	_, td, _, err := s.CalcOptionsFromSpec()
+	if err != nil {
+		t.Fatalf("CalcOptionsFromSpec: %v", err)
+	}
+	if td != "2026-12-01" {
+		t.Errorf("triggerDate = %q, want override 2026-12-01", td)
+	}
+}
+
+// TestScenarioSpec_NoBaseTrigger pins the safety check that a spec
+// without base_trigger_date AND without per-proceeding override
+// surfaces ErrInvalidScenario (the engine can't render without a date).
+func TestScenarioSpec_NoBaseTrigger(t *testing.T) {
+	s := &ScenarioSpec{
+		Version: 1,
+		Proceedings: []ScenarioProceeding{{
+			Code: "upc.inf.cfi",
+			Role: ScenarioRolePrimary,
+		}},
+	}
+	_, _, _, err := s.CalcOptionsFromSpec()
+	if err == nil {
+		t.Fatal("want ErrInvalidScenario, got nil")
+	}
+}

pkg/litigationplanner/types.go

@@ -185,6 +185,65 @@ type ProceedingType struct {
 	// — today the unified upc.apl row has this NULL (per-rule targets
 	// live on Rule.AppliesToTarget).
 	AppealTarget *string `db:"appeal_target" json:"appeal_target,omitempty"`
+
+	// Role label overrides (t-paliad-301 / m/paliad#132, mig 137).
+	// NULL = renderer falls back to the language-default labels
+	// ("Klägerseite" / "Beklagtenseite" / "Claimant side" / "Defendant side").
+	// Set on proceedings where the role-naming diverges from the
+	// claimant/defendant default (Appeal → Berufungskläger /
+	// Berufungsbeklagter; Revocation → Antragsteller /
+	// Antragsgegner Nichtigkeit; EPA Opposition → Einsprechende(r) /
+	// Patentinhaber(in)).
+	RoleProactiveLabelDE *string `db:"role_proactive_label_de" json:"role_proactive_label_de,omitempty"`
+	RoleProactiveLabelEN *string `db:"role_proactive_label_en" json:"role_proactive_label_en,omitempty"`
+	RoleReactiveLabelDE  *string `db:"role_reactive_label_de"  json:"role_reactive_label_de,omitempty"`
+	RoleReactiveLabelEN  *string `db:"role_reactive_label_en"  json:"role_reactive_label_en,omitempty"`
+}
+
+// TriggerEventLabelForAppealTarget returns the per-target
+// "Auslösendes Ereignis" label for the unified UPC Berufung
+// proceeding (t-paliad-301 / m/paliad#132 Bug B). The trigger event
+// for an appeal is the underlying decision, not the appeal
+// proceeding itself — these labels override the proceeding's own
+// trigger_event_label when appeal_target is set.
+//
+// lang ∈ {"de", "en"}; any other value falls through to "de" so the
+// caller never gets an empty string.
+//
+// Returns empty when target is empty / unknown (caller must fall
+// back to the proceeding's own trigger_event_label).
+func TriggerEventLabelForAppealTarget(target, lang string) string {
+	if lang != "en" {
+		lang = "de"
+	}
+	switch target {
+	case AppealTargetEndentscheidung:
+		if lang == "en" {
+			return "Final decision (R.118)"
+		}
+		return "Endentscheidung (R.118)"
+	case AppealTargetKostenentscheidung:
+		if lang == "en" {
+			return "Cost decision"
+		}
+		return "Kostenentscheidung"
+	case AppealTargetAnordnung:
+		if lang == "en" {
+			return "Order"
+		}
+		return "Anordnung"
+	case AppealTargetSchadensbemessung:
+		if lang == "en" {
+			return "Damages-assessment decision"
+		}
+		return "Entscheidung im Schadensbemessungsverfahren"
+	case AppealTargetBucheinsicht:
+		if lang == "en" {
+			return "Book-inspection order"
+		}
+		return "Anordnung der Bucheinsicht"
+	}
+	return ""
 }
 
 // AdjustmentReason describes why a date was rolled forward / backward
@@ -382,6 +441,22 @@ type TimelineEntry struct {
 	DurationValue int    `json:"durationValue,omitempty"`
 	DurationUnit  string `json:"durationUnit,omitempty"`
 	Timing        string `json:"timing,omitempty"`
+
+	// AppealRole carries the rule's appeal-filer role (t-paliad-307 /
+	// m/paliad#136 Bug 1) when the timeline was computed under an
+	// appeal_target filter. One of AppealRoleAppellant /
+	// AppealRoleAppellee, or empty for court events / non-appeal
+	// timelines. The frontend column-bucketer reads this to route
+	// primary_party='both' rules to Berufungskläger vs
+	// Berufungsbeklagter columns once the user picks a side.
+	AppealRole string `json:"appealRole,omitempty"`
+
+	// IsTriggerEvent marks the synthetic root row that represents the
+	// decision being appealed (t-paliad-307 / m/paliad#136 Bug 2).
+	// Distinct from IsRootEvent in that the row carries no real rule
+	// id — it's a UI marker dated to the trigger date with the
+	// per-appeal-target label from TriggerEventLabelForAppealTarget.
+	IsTriggerEvent bool `json:"isTriggerEvent,omitempty"`
 }
 
 // RuleCalculation is the single-rule calc response that backs the

scripts/gen-skeleton-submission-template/main.go

@@ -39,9 +39,17 @@ import (
 	"time"
 )
 
+// anchorsOnly switches the body emitter from the legacy variable-bag
+// banner template to the Composer Slice B anchor-only body. Toggled
+// via the -anchors flag; default true so the Slice B regen produces
+// the composer-ready file.
+var anchorsOnly = true
+
 func main() {
 	out := flag.String("out", "_skeleton.docx", "output .docx path")
+	anchors := flag.Bool("anchors", true, "emit Composer-mode body with section anchors only (t-paliad-313 Slice B); false = legacy variable-bag banner body")
 	flag.Parse()
+	anchorsOnly = *anchors
 
 	docx, err := buildDocx()
 	if err != nil {
@@ -156,6 +164,45 @@ const stylesXML = `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 // DEMO/SKELETON banner makes it obvious this is a starter template and
 // not approved firm content.
 func buildDocumentXML() string {
+	if anchorsOnly {
+		return buildAnchoredDocumentXML()
+	}
+	return buildLegacyDocumentXML()
+}
+
+// buildAnchoredDocumentXML emits the Composer-mode body: just section
+// anchors. The composer pipeline (services/submission_compose.go)
+// replaces each {{#section:KEY}}...{{/section:KEY}} paragraph pair
+// with the rendered section content from submission_sections.
+// Pre-Composer drafts continue to use the legacy body (run with
+// -anchors=false).
+//
+// Order matches the default section spec in mig 146:
+// letterhead, caption, introduction, requests, facts,
+// legal_argument, evidence, exhibits, closing, signature.
+func buildAnchoredDocumentXML() string {
+	var b strings.Builder
+	b.WriteString(`<?xml version="1.0" encoding="UTF-8" standalone="yes"?>`)
+	b.WriteString(`<w:document xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main">`)
+	b.WriteString(`<w:body>`)
+
+	anchorPair := func(key string) {
+		plain(&b, "{{#section:"+key+"}}")
+		plain(&b, "{{/section:"+key+"}}")
+	}
+	for _, key := range []string{
+		"letterhead", "caption", "introduction", "requests",
+		"facts", "legal_argument", "evidence", "exhibits",
+		"closing", "signature",
+	} {
+		anchorPair(key)
+	}
+
+	b.WriteString(`</w:body></w:document>`)
+	return b.String()
+}
+
+func buildLegacyDocumentXML() string {
 	var b strings.Builder
 	b.WriteString(`<?xml version="1.0" encoding="UTF-8" standalone="yes"?>`)
 	b.WriteString(`<w:document xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main">`)